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<title>Methoxy group</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Methoxy group</span></span>

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<p>In <a href="Organic_chemistry" title="Organic chemistry">organic chemistry</a>, a <b>methoxy group</b> is the <a href="Functional_group" title="Functional group">functional group</a> consisting of a <a href="Methyl_group" title="Methyl group">methyl group</a> bound to <a href="Oxygen" title="Oxygen">oxygen</a>. This <a href="Alkoxy_group" title="Alkoxy group">alkoxy group</a> has the formula <style data-mw-deduplicate="TemplateStyles:r1123817410">

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.mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:left}.mw-parser-output sub.template-chem2-sub{font-size:80%;vertical-align:-0.35em}.mw-parser-output sup.template-chem2-sup{font-size:80%;vertical-align:0.65em}

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</style><span class="chemf nowrap">R−O−CH<sub class="template-chem2-sub">3</sub></span>.

</p><p>On a <a href="Benzene_ring" class="mw-redirect" title="Benzene ring">benzene ring</a>, the <a href="Hammett_equation" title="Hammett equation">Hammett equation</a> classifies a methoxy substituent at the <i>para</i> position as an <a href="Electron-donating_group" class="mw-redirect" title="Electron-donating group">electron-donating group</a>, but as an <a href="Electron-withdrawing_group" title="Electron-withdrawing group">electron-withdrawing group</a> if at the <i>meta</i> position. At the <i>ortho</i> position, <a href="Steric_effects" title="Steric effects">steric effects</a> are likely to cause a significant alteration in the Hammett equation prediction, which otherwise follows the same trend as that of the <i>para</i> position.

</p>

<div class="mw-heading mw-heading2"><h2 id="Occurrence">Occurrence</h2></div>

<p>The simplest of methoxy compounds are <a href="Methanol" title="Methanol">methanol</a> and <a href="Dimethyl_ether" title="Dimethyl ether">dimethyl ether</a>. Other methoxy ethers include <a href="Anisole" title="Anisole">anisole</a> and <a href="Vanillin" title="Vanillin">vanillin</a>. Many metal alkoxides contain methoxy groups, such as <a href="Tetramethyl_orthosilicate" title="Tetramethyl orthosilicate">tetramethyl orthosilicate</a> and <a href="Titanium_methoxide" class="mw-redirect" title="Titanium methoxide">titanium methoxide</a>. <a href="Ester" title="Ester">Esters</a> with a methoxy group can be referred to as methyl esters, and the —COOCH<sub>3</sub> substituent is called a methoxycarbonyl.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading3"><h3 id="Biosynthesis">Biosynthesis</h3></div>

<p>In nature, methoxy groups are found on nucleosides subjected to <a href="2'-O-methylation" title="2'-O-methylation">2′-<i>O</i>-methylation</a>, for example, in variations of the <a href="Five-prime_cap" title="Five-prime cap">5′-cap structure</a> known as cap-1 and cap-2. They are also common substituents in <a href="O-methylated_flavonoid" title="O-methylated flavonoid"><i>O</i>-methylated flavonoids</a>, whose formation is catalyzed by <a href="O-methyltransferase" title="O-methyltransferase">O-methyltransferases</a> that act on <a href="Phenol" title="Phenol">phenols</a>, such as <a href="Catechol-O-methyl_transferase" class="mw-redirect" title="Catechol-O-methyl transferase">catechol-<i>O</i>-methyl transferase</a> (COMT). Many natural products in plants, such as <a href="Lignin" title="Lignin">lignins</a>, are generated via catalysis by <a href="Caffeoyl-CoA_O-methyltransferase" title="Caffeoyl-CoA O-methyltransferase">caffeoyl-CoA <i>O</i>-methyltransferase</a>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading3"><h3 id="Methoxylation">Methoxylation</h3></div>

<p>Organic methoxides are often produced by <a href="Methylation" title="Methylation">methylation</a> of alkoxides.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Some aryl methoxides can be synthesized by metal-catalyzed methylation of <a href="Phenol" title="Phenol">phenols</a>, or by methoxylation of <a href="Aryl_halide" title="Aryl halide">aryl halides</a>.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite id="CITEREFStreitwieser1992" class="citation book cs1">Streitwieser, Andrew (1992). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/introductiontoor00stre_0/page/515"><i>Introduction to organic chemistry</i></a></span>. Heathcock, Clayton H., Kosower, Edward M. (4th ed.). New York: Macmillan. pp. <a rel="nofollow" class="external text" href="https://archive.org/details/introductiontoor00stre_0/page/515">515</a>. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>0024181706</bdi>. <a href="OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/24501305">24501305</a>.</cite></span>

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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite id="CITEREFBoerjanRalphBaucher2003" class="citation journal cs1">Boerjan, Wout; Ralph, John; Baucher, Marie (2003). "Lignin Biosynthesis". <i>Annu. Rev. Plant Biol</i>. <b>54</b> (1): <span class="nowrap">519–</span>46. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1146%2Fannurev.arplant.54.031902.134938">10.1146/annurev.arplant.54.031902.134938</a>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/14503002">14503002</a>.</cite></span>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFScarrowAllen1933" class="citation journal cs1">Scarrow, J. A.; Allen, C. F. H. (1933). "Methoxyacetonitrile". <i>Org. Synth</i>. <b>13</b>: 56. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.15227%2Forgsyn.013.0056">10.15227/orgsyn.013.0056</a>.</cite></span>

</li>

<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite id="CITEREFCornellaZarateMartin2014" class="citation journal cs1">Cornella, Josep; Zarate, Cayetana; Martin, Ruben (2014). <a rel="nofollow" class="external text" href="https://doi.org/10.15227%2Forgsyn.091.0260">"Ni-catalyzed Reductive Cleavage of Methyl 3-Methoxy-2-Naphthoate"</a>. <i>Org. Synth</i>. <b>91</b>: <span class="nowrap">260–</span>272. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.15227%2Forgsyn.091.0260">10.15227/orgsyn.091.0260</a></span>.</cite></span>

</li>

<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite id="CITEREFCheungBuchwald2013" class="citation journal cs1">Cheung, Chi Wai; Buchwald, Stephen L. (2 August 2013). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3776604">"Mild and General Palladium-Catalyzed Synthesis of Methyl Aryl Ethers Enabled by the Use of a Palladacycle Precatalyst"</a>. <i>Organic Letters</i>. <b>15</b> (15): <span class="nowrap">3998–</span>4001. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1021%2Fol401796v">10.1021/ol401796v</a>. <a href="PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3776604">3776604</a></span>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/23883393">23883393</a>.</cite></span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><cite id="CITEREFTolnaiPethőKrállNovák2014" class="citation journal cs1">Tolnai, Gergely L.; Pethő, Bálint; Králl, Péter; Novák, Zoltán (13 January 2014). "Palladium-Catalyzed Methoxylation of Aromatic Chlorides with Borate Salts". <i>Advanced Synthesis & Catalysis</i>. <b>356</b> (1): <span class="nowrap">125–</span>129. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2Fadsc.201300687">10.1002/adsc.201300687</a>.</cite></span>

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</style><div id="Functional_groups729" style="font-size:114%;margin:0 4em"><a href="Functional_group" title="Functional group">Functional groups</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Hydrocarbon" title="Hydrocarbon">Hydrocarbons</a> <br><span class="nobold">(only C and H)</span></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Alkyl" class="mw-redirect" title="Alkyl">Alkyl</a>

<ul><li><a href="Methyl_group" title="Methyl group">Methyl</a></li>

<li><a href="Ethyl_group" title="Ethyl group">Ethyl</a></li>

<li><a href="Propyl_group" title="Propyl group">Propyl</a></li>

<li><a href="Cyclopropyl" class="mw-redirect" title="Cyclopropyl">Cyclopropyl</a></li>

<li><a href="Butyl_group" title="Butyl group">Butyl</a></li>

<li><a href="Pentyl_group" title="Pentyl group">Pentyl</a></li></ul></li>

<li><a href="Methylene_group" title="Methylene group">Methylene</a>

<ul><li><a href="Methylene_bridge" title="Methylene bridge">Bridge</a></li>

<li><a href="Methine_group" title="Methine group">Methine</a></li></ul></li>

<li><a href="Alkene" title="Alkene">Alkene</a>

<ul><li><a href="Vinyl_group" title="Vinyl group">Vinyl</a></li>

<li><a href="Allyl_group" title="Allyl group">Allyl</a></li>

<li><a href="Propenyl" title="Propenyl">1-Propenyl</a></li>

<li><a href="Crotyl_group" title="Crotyl group">Crotyl</a></li>

<li><a href="Allenes" title="Allenes">Allene</a></li>

<li><a href="Cumulene" title="Cumulene">Cumulene</a></li></ul></li>

<ul><li><a href="Phenyl_group" title="Phenyl group">Phenyl</a></li>

<li><a href="Benzyl_group" title="Benzyl group">Benzyl</a></li></ul></li>

<li><a href="Alkyne" title="Alkyne">Alkyne</a></li>

<li><a href="Carbene" title="Carbene">Carbene</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Only <a href="Carbon" title="Carbon">carbon</a>, <br><a href="Hydrogen" title="Hydrogen">hydrogen</a>, <br>and <a href="Oxygen" title="Oxygen">oxygen</a> <br><span class="nobold">(only C, H and O)</span></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">R-O-R</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Acetal" title="Acetal">Acetal</a></li>

<li><a href="Alcohol_(chemistry)" title="Alcohol (chemistry)">Alcohol</a></li>

<li><a href="Alkoxy_group" title="Alkoxy group">Alkoxy</a>

<li><a href="Ether" title="Ether">Ether</a>

<ul><li><a href="Enol_ether" title="Enol ether">Enol ether</a></li>

<li><a href="Epoxide" title="Epoxide">Epoxide</a></li></ul></li>

<li><a href="Organic_peroxides" title="Organic peroxides">Peroxy</a>

<ul><li><a href="Hydroperoxide" title="Hydroperoxide">Hydroperoxy</a></li>

<li><a href="Dioxirane" title="Dioxirane">Dioxiranes</a></li></ul></li>

<li><a href="Ethylenedioxy" title="Ethylenedioxy">Ethylenedioxy</a></li>

<li><a href="Methylenedioxy" title="Methylenedioxy">Methylenedioxy</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Carbonyl_group" title="Carbonyl group">carbonyl</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Acetyl_group" title="Acetyl group">Acetyl</a></li>

<li><a href="Acryloyl_group" class="mw-redirect" title="Acryloyl group">Acryloyl</a></li>

<li><a href="Benzoyl_group" title="Benzoyl group">Benzoyl</a></li></ul></li>

<li><a href="Aldehyde" title="Aldehyde">Aldehyde</a>

<ul><li><a href="Ketene" title="Ketene">Ketene</a></li></ul></li>

<li><a href="Ketone" title="Ketone">Ketone</a></li>

<li><a href="Ynone" title="Ynone">Ynone</a></li>

<li><a href="Reductone" title="Reductone">Reductone</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">carboxy</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Carboxylic_acid" title="Carboxylic acid">Carboxyl</a>

<ul><li><a href="Acetoxy_group" title="Acetoxy group">Acetoxy</a></li>

<li><a href="Carboxylic_anhydride" class="mw-redirect" title="Carboxylic anhydride">Anhydride</a></li></ul></li>

<li><a href="Ester" title="Ester">Ester</a>

<ul><li><a href="Orthoester" class="mw-redirect" title="Orthoester">Orthoester</a></li></ul></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Only one <br>element, <br>not being <br>carbon, <br>hydrogen, <br>or oxygen <br><span class="nobold">(one element, <br>not C, H or O)</span></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Nitrogen" title="Nitrogen">Nitrogen</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Amine" title="Amine">Amine</a>

<ul><li><a href="Enamine" title="Enamine">Enamine</a></li>

<li><a href="Quaternary_ammonium_cation" title="Quaternary ammonium cation">Ammonium</a></li></ul></li>

<li><a href="Hydrazines" title="Hydrazines">Hydrazo</a></li>

<li><a href="Nitrene" title="Nitrene">Nitrene</a></li>

<li><a href="Imine" title="Imine">Imine</a></li>

<li><a href="Oxime" title="Oxime">Oxime</a></li>

<li><a href="Hydrazone" title="Hydrazone">Hydrazone</a></li>

<li><a href="Amide_(functional_group)" title="Amide (functional group)">Amide</a></li>

<li><a href="Imidate" class="mw-redirect" title="Imidate">Imidate</a></li>

<li><a href="Amidine" title="Amidine">Amidine</a></li>

<li><a href="Carbamate" title="Carbamate">Carbamate</a></li>

<li><a href="Imide" title="Imide">Imide</a></li>

<li><a href="Nitrile" title="Nitrile">Nitrile</a></li>

<li><a href="Isocyanide" title="Isocyanide">Isonitrile</a></li>

<li><a href="Cyanate_ester" title="Cyanate ester">Cyanate</a></li>

<li><a href="Isocyanate" title="Isocyanate">Isocyanate</a></li>

<li><a href="Nitrate_ester" title="Nitrate ester">Nitrate</a></li>

<li><a href="Nitrite_ester" class="mw-redirect" title="Nitrite ester">Nitrite</a></li>

<li><a href="Nitro_compound" title="Nitro compound">Nitro</a></li>

<li><a href="Nitroso" title="Nitroso">Nitroso</a></li>

<li><a href="NONOate" title="NONOate">NONOate</a></li>

<li><a href="Triazole" title="Triazole">Triazole</a></li>

<li><a href="Tetrazole" title="Tetrazole">Tetrazole</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Silicon" title="Silicon">Silicon</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Silane" title="Silane">Silane</a>

<ul><li><a href="Hydrosilane" class="mw-redirect" title="Hydrosilane">Hydrosilane</a></li>

<li><a href="Chlorosilane" title="Chlorosilane">Chlorosilane</a></li></ul></li>

<li><a href="Organosilicon_chemistry#Silenes" title="Organosilicon chemistry">Silene</a></li>

<li><a href="Silanol" title="Silanol">Silanol</a></li>

<li><a href="Siloxide" title="Siloxide">Siloxide</a></li>

<li><a href="Siloxane" title="Siloxane">Siloxane</a></li>

<li><a href="Silanone" title="Silanone">Silanone</a></li>

<li><a href="Silyl_ether" title="Silyl ether">Silether</a></li>

<li><a href="Metalloles" class="mw-redirect" title="Metalloles">Silole</a></li>

<li><a href="Silatrane" class="mw-redirect" title="Silatrane">Silatrane</a></li>

<li><a href="Silicate" title="Silicate">Silicate</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Phosphorus" title="Phosphorus">Phosphorus</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Organophosphate" title="Organophosphate">Phosphate</a>

<ul><li><a href="Phosphodiester" class="mw-redirect" title="Phosphodiester">Phosphodiester</a></li></ul></li>

<li><a href="Phosphonate" title="Phosphonate">Phosphonate</a>

<ul><li><a href="Phosphite_ester" title="Phosphite ester">Phosphite</a></li></ul></li>

<li><a href="Phosphonite" title="Phosphonite">Phosphonous</a></li>

<li><a href="Phosphinate" title="Phosphinate">Phosphinate</a></li>

<li><a href="Phosphine_oxide" title="Phosphine oxide">Phosphine oxide</a></li>

<li><a href="Organophosphine" title="Organophosphine">Phosphine</a>

<ul><li><a href="Phosphonium" title="Phosphonium">Phosphonium</a></li></ul></li>

<li><a href="Phosphaalkene" title="Phosphaalkene">Phosphaalkene</a></li>

<li><a href="Phosphaalkyne" title="Phosphaalkyne">Phosphaalkyne</a></li>

<li><a href="1-Phosphaallenes" title="1-Phosphaallenes">Phosphaallene</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Sulfur" title="Sulfur">Sulfur</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Thiol" title="Thiol">Thiol</a></li>

<li><a href="Thioether" class="mw-redirect" title="Thioether">Thioether</a>

<ul><li><a href="Sulfonium" title="Sulfonium">Sulfonium</a></li>

<li><a href="Thia-crown_ether" title="Thia-crown ether">Thia-crown ether</a></li></ul></li>

<li><a href="Persulfide" title="Persulfide">Persulfide</a></li>

<li><a href="Disulfide" title="Disulfide">Disulfide</a></li>

<li><a href="Sulfenic_acid" title="Sulfenic acid">Sulfenic acid</a></li>

<li><a href="Thiosulfinate" title="Thiosulfinate">Thiosulfinate</a></li>

<li><a href="Sulfoxide" title="Sulfoxide">Sulfoxide</a></li>

<li><a href="Thiosulfonate" title="Thiosulfonate">Thiosulfonate</a></li>

<li><a href="Sulfinic_acid" title="Sulfinic acid">Sulfinic acid</a></li>

<li><a href="Sulfone" title="Sulfone">Sulfone</a></li>

<li><a href="Sulfonic_acid" title="Sulfonic acid">Sulfonic acid</a></li>

<li><a href="Thioketone" title="Thioketone">Thioketone</a></li>

<li><a href="Thial" title="Thial">Thial</a></li>

<li><a href="Thioester" title="Thioester">Thioester</a></li>

<li><a href="Thionoester" class="mw-redirect" title="Thionoester">Thionoester</a></li>

<li><a href="Thioxanthate" title="Thioxanthate">Thioxanthate</a></li>

<li><a href="Xanthate" title="Xanthate">Xanthate</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Boron" title="Boron">Boron</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Boronic_acid" title="Boronic acid">Boronic acid</a></li>

<li><a href="Borinic_acid" title="Borinic acid">Borinic acid</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Selenium" title="Selenium">Selenium</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Selenol" title="Selenol">Selenol</a></li>

<li><a href="Selenonic_acid" title="Selenonic acid">Selenonic acid</a></li>

<li><a href="Seleninic_acid" title="Seleninic acid">Seleninic acid</a></li>

<li><a href="Selenenic_acid" title="Selenenic acid">Selenenic acid</a></li>

<li><a href="Selone" title="Selone">Selone</a></li>

<li><a href="Selenide#Inorganic_selenides" title="Selenide">Selenoether</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Tellurium" title="Tellurium">Tellurium</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Tellurol" title="Tellurol">Tellurol</a></li>

<li><a href="Telluroketone" title="Telluroketone">Telluroketone</a></li>

<li><a href="Telluride_(chemistry)#Organic_tellurides" title="Telluride (chemistry)">telluroether</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Polonium" title="Polonium">Polonium</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Polonium_hydride#Properties" title="Polonium hydride">Polonol</a></li>

<li><a href="Organopolonium_chemistry" title="Organopolonium chemistry">Polonoether</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><i><a href="Halocarbon" title="Halocarbon">Halo</a></i></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Haloalkane" title="Haloalkane">Haloalkane</a>

<ul><li><a href="Fluoroethyl" title="Fluoroethyl">Fluoroethyl</a></li>

<li><a href="Trifluoromethyl" class="mw-redirect" title="Trifluoromethyl">Trifluoromethyl</a></li>

<li><a href="Trichloromethyl_group" title="Trichloromethyl group">Trichloromethyl</a></li>

<li><a href="Trifluoromethoxy_group" title="Trifluoromethoxy group">Trifluoromethoxy</a></li>

<li><a href="Iodane" class="mw-redirect" title="Iodane">Hypervalent iodine</a></li></ul></li>

<li><a href="Vinyl_halide" title="Vinyl halide">Vinyl halide</a>

<ul><li><a href="Vinyl_iodide_functional_group" title="Vinyl iodide functional group">Iodide</a></li></ul></li>

<li><a href="Acyl_halide" title="Acyl halide">Acyl halide</a>

<ul><li><a href="Acyl_chloride" title="Acyl chloride">Chloride</a></li></ul></li>

<li><a href="Perchlorate_ester" class="mw-redirect" title="Perchlorate ester">Perchlorate</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Isothiocyanate" title="Isothiocyanate">Isothiocyanate</a></li>

<li><a href="Phosphoramides" title="Phosphoramides">Phosphoramides</a></li>

<li><a href="Sulfenyl_chloride" title="Sulfenyl chloride">Sulfenyl chloride</a></li>

<li><a href="Sulfonamide" title="Sulfonamide">Sulfonamide</a></li>

<li><a href="Organic_thiocyanates" title="Organic thiocyanates">Thiocyanate</a></li>

<li><a href="Sulfinylamine" title="Sulfinylamine">Sulfinylamines</a></li></ul>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>

<dd><i><a href="Chemical_classification" class="mw-redirect" title="Chemical classification">chemical classification</a></i></dd>

<dd><i><a href="Chemical_nomenclature" title="Chemical nomenclature">chemical nomenclature</a></i>

<dl><dd><a href="IUPAC_nomenclature_of_inorganic_chemistry" title="IUPAC nomenclature of inorganic chemistry">inorganic</a></dd>

<dd><a href="IUPAC_nomenclature_of_organic_chemistry" title="IUPAC nomenclature of organic chemistry">organic</a></dd></dl></dd></dl>

</div></td></tr></tbody></table></div>

<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Molecules_detected_in_outer_space800" style="padding:3px"><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Molecules_detected_in_outer_space800" style="font-size:114%;margin:0 4em"><a href="List_of_interstellar_and_circumstellar_molecules" title="List of interstellar and circumstellar molecules">Molecules detected in outer space</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Molecule" title="Molecule">Molecules</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Diatomic_molecule" title="Diatomic molecule">Diatomic</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Aluminium_monochloride" title="Aluminium monochloride">Aluminium monochloride</a></li>

<li><a href="Aluminium_monofluoride" title="Aluminium monofluoride">Aluminium monofluoride</a></li>

<li><a href="Aluminium(II)_oxide" title="Aluminium(II) oxide">Aluminium(II) oxide</a></li>

<li><a href="Argonium" title="Argonium">Argonium</a></li>

<li><a href="Carbon_cation" class="mw-redirect" title="Carbon cation">Carbon cation</a></li>

<li><a href="Carbon_monophosphide" title="Carbon monophosphide">Carbon monophosphide</a></li>

<li><a href="Carbon_monosulfide" title="Carbon monosulfide">Carbon monosulfide</a></li>

<li><a href="Carbon_monoxide" title="Carbon monoxide">Carbon monoxide</a></li>

<li><a href="Cyano_radical" title="Cyano radical">Cyano radical</a></li>

<li><a href="Diatomic_carbon" title="Diatomic carbon">Diatomic carbon</a></li>

<li>Fluoromethylidynium</li>

<li><a href="Helium_hydride_ion" title="Helium hydride ion">Helium hydride ion</a></li>

<li><a href="Hydrogen_chloride" title="Hydrogen chloride">Hydrogen chloride</a></li>

<li><a href="Hydrogen_fluoride" title="Hydrogen fluoride">Hydrogen fluoride</a></li>

<li><a href="Hydrogen" title="Hydrogen">Hydrogen</a> (molecular)</li>

<li><a href="Hydroxyl_radical" title="Hydroxyl radical">Hydroxyl radical</a></li>

<li><a href="Imidogen" title="Imidogen">Imidogen</a></li>

<li><a href="Iron(II)_oxide" title="Iron(II) oxide">Iron(II) oxide</a></li>

<li><a href="Magnesium_monohydride" title="Magnesium monohydride">Magnesium monohydride</a></li>

<li><a href="Methylidyne_radical" title="Methylidyne radical">Methylidyne radical</a></li>

<li><a href="Nitric_oxide" title="Nitric oxide">Nitric oxide</a></li>

<li><a href="Nitrogen" title="Nitrogen">Nitrogen</a> (molecular)</li>

<li><a href="Oxygen" title="Oxygen">Oxygen</a> (molecular)</li>

<li><a href="Phosphorus_monoxide" title="Phosphorus monoxide">Phosphorus monoxide</a></li>

<li><a href="Phosphorus_mononitride" title="Phosphorus mononitride">Phosphorus mononitride</a></li>

<li><a href="Potassium_chloride" title="Potassium chloride">Potassium chloride</a></li>

<li><a href="Silicon_carbide" title="Silicon carbide">Silicon carbide</a></li>

<li><a href="Silicon_monoxide" title="Silicon monoxide">Silicon monoxide</a></li>

<li><a href="Silicon_monosulfide" title="Silicon monosulfide">Silicon monosulfide</a></li>

<li><a href="Sodium_chloride" title="Sodium chloride">Sodium chloride</a></li>

<li><a href="Sodium_iodide" title="Sodium iodide">Sodium iodide</a></li>

<li><a href="Sulfanyl" title="Sulfanyl">Sulfanyl</a></li>

<li><a href="Sulfur_mononitride" title="Sulfur mononitride">Sulfur mononitride</a></li>

<li><a href="Sulfur_monoxide" title="Sulfur monoxide">Sulfur monoxide</a></li>

<li><a href="Titanium(II)_oxide" title="Titanium(II) oxide">Titanium(II) oxide</a></li></ul>

</div></td><td class="noviewer navbox-image" rowspan="9" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="Nitrous_oxide" title="Nitrous oxide"></a></span> <br><br><br><br> <span typeof="mw:File"><a href="Ethanol" title="Ethanol"></a></span> <br><br><br><br> <span typeof="mw:File"><a href="Buckminsterfullerene" title="Buckminsterfullerene"></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Triatomic_molecule" title="Triatomic molecule">Triatomic</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Aluminium(I)_hydroxide" class="mw-redirect" title="Aluminium(I) hydroxide">Aluminium(I) hydroxide</a></li>

<li>Aluminium isocyanide</li>

<li><a href="Amino_radical" title="Amino radical">Amino radical</a></li>

<li><a href="Carbon_dioxide" title="Carbon dioxide">Carbon dioxide</a></li>

<li><a href="Carbonyl_sulfide" title="Carbonyl sulfide">Carbonyl sulfide</a></li>

<li>CCP radical</li>

<li><a href="Halonium_ion" title="Halonium ion">Chloronium</a></li>

<li><a href="Diazenylium" title="Diazenylium">Diazenylium</a></li>

<li><a href="Dicarbon_monoxide" title="Dicarbon monoxide">Dicarbon monoxide</a></li>

<li>Disilicon carbide</li>

<li><a href="Ethynyl_radical" title="Ethynyl radical">Ethynyl radical</a></li>

<li>Formyl radical</li>

<li><a href="Hydrogen_cyanide" title="Hydrogen cyanide">Hydrogen cyanide</a> (HCN)</li>

<li><a href="Hydrogen_isocyanide" title="Hydrogen isocyanide">Hydrogen isocyanide</a> (HNC)</li>

<li><a href="Hydrogen_sulfide" title="Hydrogen sulfide">Hydrogen sulfide</a></li>

<li><a href="Hydroperoxyl" title="Hydroperoxyl">Hydroperoxyl</a></li>

<li><a href="Iron(II)_cyanide" title="Iron(II) cyanide">Iron cyanide</a></li>

<li>Isoformyl</li>

<li><a href="Magnesium_cyanide" title="Magnesium cyanide">Magnesium cyanide</a></li>

<li>Magnesium isocyanide</li>

<li><a href="Methylene_(compound)" title="Methylene (compound)">Methylene</a></li>

<li><a href="Methylidynephosphane" title="Methylidynephosphane">Methylidynephosphane</a></li>

<li><a href="Nitrous_oxide" title="Nitrous oxide">Nitrous oxide</a></li>

<li><a href="Nitroxyl" title="Nitroxyl">Nitroxyl</a></li>

<li><a href="Ozone" title="Ozone">Ozone</a></li>

<li><a href="Potassium_cyanide" title="Potassium cyanide">Potassium cyanide</a></li>

<li><a href="Sodium_cyanide" title="Sodium cyanide">Sodium cyanide</a></li>

<li><a href="Sodium_hydroxide" title="Sodium hydroxide">Sodium hydroxide</a></li>

<li>Silicon carbonitride</li>

<li>c-Silicon dicarbide</li>

<li><a href="Sulfur_dioxide" title="Sulfur dioxide">Sulfur dioxide</a></li>

<li>Thioformyl</li>

<li><a href="Thioxoethenylidene" title="Thioxoethenylidene">Thioxoethenylidene</a></li>

<li><a href="Titanium_dioxide" title="Titanium dioxide">Titanium dioxide</a></li>

<li><a href="Tricarbon" title="Tricarbon">Tricarbon</a></li>

<li><a href="Trihydrogen_cation" title="Trihydrogen cation">Trihydrogen cation</a></li>

<li><a href="Water" title="Water">Water</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Four<br>atoms</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Acetylene" title="Acetylene">Acetylene</a></li>

<li><a href="Ammonia" title="Ammonia">Ammonia</a></li>

<li><a href="Polyyne" title="Polyyne">Cyanoethynyl</a></li>

<li><a href="Interstellar_formaldehyde" title="Interstellar formaldehyde">Formaldehyde</a></li>

<li><a href="Fulminic_acid" title="Fulminic acid">Fulminic acid</a></li>

<li><a href="Hydrogen_peroxide" title="Hydrogen peroxide">Hydrogen peroxide</a></li>

<li>Hydromagnesium isocyanide</li>

<li><a href="Isocyanic_acid" title="Isocyanic acid">Isocyanic acid</a></li>

<li><a href="Thiocyanic_acid" title="Thiocyanic acid">Isothiocyanic acid</a></li>

<li>Ketenyl</li>

<li><a href="Methyl_cation" class="mw-redirect" title="Methyl cation">Methyl cation</a></li>

<li><a href="Methyl_radical" title="Methyl radical">Methyl radical</a></li>

<li>Methylene amidogen</li>

<li><a href="Propynylidyne" title="Propynylidyne">Propynylidyne</a></li>

<li>Protonated carbon dioxide</li>

<li><a href="Protonated_hydrogen_cyanide" title="Protonated hydrogen cyanide">Protonated hydrogen cyanide</a></li>

<li>Silicon tricarbide</li>

<li><a href="Thiocyanic_acid" title="Thiocyanic acid">Thiocyanic acid</a></li>

<li><a href="Thioformaldehyde" title="Thioformaldehyde">Thioformaldehyde</a></li>

<li><a href="Tricarbon_monosulfide" title="Tricarbon monosulfide">Tricarbon monosulfide</a></li>

<li><a href="Tricarbon_monoxide" title="Tricarbon monoxide">Tricarbon monoxide</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Five<br>atoms</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Ammonium" title="Ammonium">Ammonium</a> ion</li>

<li><a href="Polyyne" title="Polyyne">Butadiynyl</a></li>

<li><a href="Carbodiimide" title="Carbodiimide">Carbodiimide</a></li>

<li><a href="Cyanamide" title="Cyanamide">Cyanamide</a></li>

<li><a href="Cyanoacetylene" title="Cyanoacetylene">Cyanoacetylene</a></li>

<li><a href="Cyanoformaldehyde" class="mw-redirect" title="Cyanoformaldehyde">Cyanoformaldehyde</a></li>

<li><a href="Cyanomethyl" title="Cyanomethyl">Cyanomethyl</a></li>

<li><a href="Cyclopropenylidene" title="Cyclopropenylidene">Cyclopropenylidene</a></li>

<li><a href="Formic_acid" title="Formic acid">Formic acid</a></li>

<li>Isocyanoacetylene</li>

<li><a href="Ketene" title="Ketene">Ketene</a></li>

<li><a href="Methane" title="Methane">Methane</a></li>

<li><a href="Methoxy" class="mw-redirect" title="Methoxy">Methoxy radical</a></li>

<li>Methylenimine</li>

<li>Propadienylidene</li>

<li>Protonated formaldehyde</li>

<li><a href="Silane" title="Silane">Silane</a></li>

<li>Silicon-carbide cluster</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Six<br>atoms</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Acetonitrile" title="Acetonitrile">Acetonitrile</a></li>

<li>Cyanobutadiynyl radical</li>

<li><a href="Cyclopropenone" title="Cyclopropenone">Cyclopropenone</a></li>

<li><a href="Diacetylene" title="Diacetylene">Diacetylene</a></li>

<li>E-Cyanomethanimine</li>

<li><a href="Ethylene" title="Ethylene">Ethylene</a></li>

<li><a href="Formamide" title="Formamide">Formamide</a></li>

<li><a href="Ketenimine" class="mw-redirect" title="Ketenimine">Ketenimine</a></li>

<li><a href="Methanethiol" title="Methanethiol">Methanethiol</a></li>

<li><a href="Methanol" title="Methanol">Methanol</a></li>

<li><a href="Methyl_isocyanide" title="Methyl isocyanide">Methyl isocyanide</a></li>

<li><a href="Polyyne" title="Polyyne">Pentynylidyne</a></li>

<li><a href="Propynal" class="mw-redirect" title="Propynal">Propynal</a></li>

<li>Protonated cyanoacetylene</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Seven<br>atoms</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Acetaldehyde" title="Acetaldehyde">Acetaldehyde</a></li>

<li><a href="Acrylonitrile" title="Acrylonitrile">Acrylonitrile</a>

<ul><li><a href="Vinyl_cyanide" class="mw-redirect" title="Vinyl cyanide">Vinyl cyanide</a></li></ul></li>

<li><a href="Cyanopolyyne" title="Cyanopolyyne">Cyanodiacetylene</a></li>

<li><a href="Ethylene_oxide" title="Ethylene oxide">Ethylene oxide</a></li>

<li><a href="Glycolonitrile" title="Glycolonitrile">Glycolonitrile</a></li>

<li><a href="Hexatriynyl_radical" title="Hexatriynyl radical">Hexatriynyl radical</a></li>

<li><a href="Methyl_isocyanate" title="Methyl isocyanate">Methyl isocyanate</a></li>

<li><a href="Methylamine" title="Methylamine">Methylamine</a></li>

<li><a href="Propyne" title="Propyne">Propyne</a></li>

<li><a href="Vinyl_alcohol" title="Vinyl alcohol">Vinyl alcohol</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Eight<br>atoms</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Acetic_acid" title="Acetic acid">Acetic acid</a></li>

<li><a href="Acrolein" title="Acrolein">Acrolein</a></li>

<li><a href="Aminoacetonitrile" title="Aminoacetonitrile">Aminoacetonitrile</a></li>

<li>Cyanoallene</li>

<li><a href="Ethanimine" title="Ethanimine">Ethanimine</a></li>

<li><a href="Glycolaldehyde" title="Glycolaldehyde">Glycolaldehyde</a></li>

<li><a href="Polyyne" title="Polyyne">Hexapentaenylidene</a></li>

<li><a href="Methyl_formate" title="Methyl formate">Methyl formate</a></li>

<li><a href="Polyyne" title="Polyyne">Methylcyanoacetylene</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Nine<br>atoms</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Acetamide" title="Acetamide">Acetamide</a></li>

<li><a href="Cyanopolyyne" title="Cyanopolyyne">Cyanohexatriyne</a></li>

<li><a href="Dimethyl_ether" title="Dimethyl ether">Dimethyl ether</a></li>

<li><a href="Ethanethiol" title="Ethanethiol">Ethanethiol</a></li>

<li><a href="Ethanol" title="Ethanol">Ethanol</a></li>

<li><a href="Polyyne" title="Polyyne">Methyldiacetylene</a></li>

<li><a href="N-Methylformamide" title="N-Methylformamide">N-Methylformamide</a></li>

<li><a href="Octatetraynyl_radical" title="Octatetraynyl radical">Octatetraynyl radical</a></li>

<li><a href="Propene" class="mw-redirect" title="Propene">Propene</a></li>

<li><a href="Propionitrile" title="Propionitrile">Propionitrile</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Ten<br>atoms<br>or more</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Acetone" title="Acetone">Acetone</a></li>

<li><a href="Benzene" title="Benzene">Benzene</a></li>

<li><a href="Benzonitrile" title="Benzonitrile">Benzonitrile</a></li>

<li><a href="Buckminsterfullerene" title="Buckminsterfullerene">Buckminsterfullerene</a> (C<sub>60</sub>, C<sub>60</sub><sup>+</sup>, fullerene, buckyball)</li>

<li><a href="Butyronitrile" title="Butyronitrile">Butyronitrile</a></li>

<li><a href="C70_fullerene" title="C70 fullerene">C<sub>70</sub> fullerene</a></li>

<li><a href="Cyanopolyyne" title="Cyanopolyyne">Cyanodecapentayne</a></li>

<li><a href="Ethyl_formate" title="Ethyl formate">Ethyl formate</a></li>

<li><a href="Ethylene_glycol" title="Ethylene glycol">Ethylene glycol</a></li>

<li>Heptatrienyl radical</li>

<li><a href="Methyl_acetate" title="Methyl acetate">Methyl acetate</a></li>

<li><a href="Cyanopolyyne" title="Cyanopolyyne">Methyl-cyano-diacetylene</a></li>

<li><a href="Polyyne" title="Polyyne">Methyltriacetylene</a></li>

<li><a href="Propionaldehyde" title="Propionaldehyde">Propionaldehyde</a></li>

<li><a href="Pyrimidine" title="Pyrimidine">Pyrimidine</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Deuterium" title="Deuterium">Deuterated</a><br>molecules</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Ammonia" title="Ammonia">Ammonia</a></li>

<li><a href="Ammonium" title="Ammonium">Ammonium</a> ion</li>

<li><a href="Formaldehyde" title="Formaldehyde">Formaldehyde</a></li>

<li><a href="Interstellar_formaldehyde#Interstellar_reactions" title="Interstellar formaldehyde">Formyl radical</a></li>

<li><a href="Heavy_water" title="Heavy water">Heavy water</a></li>

<li><a href="Hydrogen_cyanide" title="Hydrogen cyanide">Hydrogen cyanide</a></li>

<li><a href="Hydrogen_deuteride" title="Hydrogen deuteride">Hydrogen deuteride</a></li>

<li><a href="Hydrogen_isocyanide" title="Hydrogen isocyanide">Hydrogen isocyanide</a></li>

<li><a href="Propyne" title="Propyne">Propyne</a></li>

<li><a href="Trihydrogen_cation" title="Trihydrogen cation">Trihydrogen cation</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Unconfirmed</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Anthracene" title="Anthracene">Anthracene</a></li>

<li><a href="Dihydroxyacetone" title="Dihydroxyacetone">Dihydroxyacetone</a></li>

<li><a href="Glycine" title="Glycine">Glycine</a></li>

<li><a href="Graphene" title="Graphene">Graphene</a></li>

<li><a href="Hemolithin" title="Hemolithin">Hemolithin</a></li>

<li><a href="Carbon" title="Carbon">Linear C<sub>5</sub></a></li>

<li><a href="Methoxyethane" title="Methoxyethane">Methoxyethane</a></li>

<li><a href="Naphthalene" title="Naphthalene">Naphthalene cation</a></li>

<li><a href="Phosphine" title="Phosphine">Phosphine</a></li>

<li><a href="Pyrene" title="Pyrene">Pyrene</a></li>

<li><a href="Silylidyne" title="Silylidyne">Silylidyne</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_interstellar_and_circumstellar_molecules#See_also" title="List of interstellar and circumstellar molecules">Related</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Abiogenesis" title="Abiogenesis">Abiogenesis</a></li>

<li><a href="Astrobiology" title="Astrobiology">Astrobiology</a></li>

<li><a href="Astrochemistry" title="Astrochemistry">Astrochemistry</a></li>

<li><a href="Atomic_and_molecular_astrophysics" title="Atomic and molecular astrophysics">Atomic and molecular astrophysics</a></li>

<li><a href="Chemical_formula" title="Chemical formula">Chemical formula</a></li>

<li><a href="Circumstellar_dust" title="Circumstellar dust">Circumstellar dust</a></li>

<li><a href="Circumstellar_envelope" title="Circumstellar envelope">Circumstellar envelope</a></li>

<li><a href="Cosmic_dust" title="Cosmic dust">Cosmic dust</a></li>

<li><a href="Cosmic_ray" title="Cosmic ray">Cosmic ray</a></li>

<li><a href="Cosmochemistry" title="Cosmochemistry">Cosmochemistry</a></li>

<li><a href="Diffuse_interstellar_band" class="mw-redirect" title="Diffuse interstellar band">Diffuse interstellar band</a></li>

<li><a href="Earliest_known_life_forms" title="Earliest known life forms">Earliest known life forms</a></li>

<li><a href="Extraterrestrial_life" title="Extraterrestrial life">Extraterrestrial life</a></li>

<li><a href="Extraterrestrial_liquid_water" title="Extraterrestrial liquid water">Extraterrestrial liquid water</a></li>

<li><a href="Forbidden_mechanism" title="Forbidden mechanism">Forbidden mechanism</a></li>

<li><a href="Homochirality" title="Homochirality">Homochirality</a></li>

<li><a href="Intergalactic_dust" title="Intergalactic dust">Intergalactic dust</a></li>

<li><a href="Interplanetary_medium" title="Interplanetary medium">Interplanetary medium</a></li>

<li><a href="Interstellar_medium" title="Interstellar medium">Interstellar medium</a></li>

<li><a href="Iron%E2%80%93sulfur_world_theory" class="mw-redirect" title="Iron–sulfur world theory">Iron–sulfur world theory</a></li>

<li><a href="Kerogen" title="Kerogen">Kerogen</a></li>

<li><a href="Molecules_in_stars" title="Molecules in stars">Molecules in stars</a></li>

<li><a href="Nexus_for_Exoplanet_System_Science" title="Nexus for Exoplanet System Science">Nexus for Exoplanet System Science</a></li>

<li><a href="Organic_compound" title="Organic compound">Organic compound</a></li>

<li><a href="Outer_space" title="Outer space">Outer space</a></li>

<li><a href="PAH_world_hypothesis" title="PAH world hypothesis">PAH world hypothesis</a></li>

<li><a href="Photodissociation_region" title="Photodissociation region">Photodissociation region</a></li>

<li><a href="Polycyclic_aromatic_hydrocarbon" title="Polycyclic aromatic hydrocarbon">Polycyclic aromatic hydrocarbon</a> (PAH)</li>

<li><a href="Pseudo-panspermia" title="Pseudo-panspermia">Pseudo-panspermia</a></li>

<li><a href="RNA_world_hypothesis" class="mw-redirect" title="RNA world hypothesis">RNA world hypothesis</a></li>

<li><a href="Spectroscopy" title="Spectroscopy">Spectroscopy</a></li>

<li><a href="Tholin" title="Tholin">Tholin</a></li></ul>

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