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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Isovanillin</span></h1>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="de" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="de" dir="ltr"><table class="wikitable infobox float-right" id="Vorlage_Infobox_Chemikalie" style="font-size:90%; margin-top:0; width:350px;" summary="Infobox Chemikalie">
<tbody><tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Strukturformel
</th></tr>
<tr>
<td colspan="2" class="hintergrundfarbe-basis skin-invert-image" style="text-align:center;"><span typeof="mw:File"></span>
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<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Allgemeines
</th></tr>
<tr>
<td style="width:33%;">Name
</td>
<td>Isovanillin
</td></tr>
<tr>
<td>Andere Namen
</td>
<td>
<ul><li>3-Hydroxy-4-methoxybenzaldehyd</li>
<li>3-Hydroxyanisaldehyd</li></ul>
</td></tr>
<tr>
<td><a href="Summenformel" title="Summenformel">Summenformel</a>
</td>
<td>C<sub>8</sub>H<sub>8</sub>O<sub>3</sub>
</td></tr>
<tr>
<td>Kurzbeschreibung
</td>
<td>
<p>schwach gelbliche glasglänzende Säulen<sup id="cite_ref-MONATSHEFTE_1882_1-0" class="reference"><a href="#cite_note-MONATSHEFTE_1882-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Externe Identifikatoren/Datenbanken
</th></tr>
<tr>
<td colspan="2" style="padding:0;">
<table class="mw-collapsible mw-collapsed wikitable" data-expandtext="+" data-collapsetext="−" style="border-top:none; margin:-1px; width:calc(100% + 2px);">
<tbody><tr>
<td style="width:33%;"><a href="CAS-Nummer" title="CAS-Nummer">CAS-Nummer</a>
</td>
<td><span title="Untervorlage eingebunden: CASRN"></span><a rel="nofollow" class="external text" href="https://commonchemistry.cas.org/detail?cas_rn=621-59-0">621-59-0</a><span class="editoronly" style="display:none;"></span>
</td>
<td style="background:#FFDEAD; color:#202122; border-top:1px solid #FFDEAD; padding:0.2em 0; vertical-align:bottom; width:5%;">
</td></tr>
<tr>
<td><a href="EG-Nummer" title="EG-Nummer">EG-Nummer</a>
</td>
<td colspan="2">210-694-9
</td></tr>
<tr>
<td><a href="Europ%C3%A4ische_Chemikalienagentur" title="Europäische Chemikalienagentur">ECHA</a>-InfoCard
</td>
<td colspan="2"><a rel="nofollow" class="external text" href="https://www.echa.europa.eu/de/substance-information/-/substanceinfo/100.009.724">100.009.724</a>
</td></tr>
<tr>
<td><a href="PubChem" title="PubChem">PubChem</a>
</td>
<td colspan="2"><a rel="nofollow" class="external text" href="https://pubchem.ncbi.nlm.nih.gov/compound/12127">12127</a>
</td></tr>
<tr>
<td><a href="ChemSpider" title="ChemSpider">ChemSpider</a>
</td>
<td colspan="2"><a rel="nofollow" class="external text" href="https://www.chemspider.com/Chemical-Structure.11629.html">11629</a>
</td></tr>
<tr>
<td style="border-right:1px solid #a2a9b1;"><a href="Wikidata" title="Wikidata">Wikidata</a>
</td>
<td colspan="2"><a href="https://www.wikidata.org/wiki/Q412986" class="extiw external" title="d:Q412986">Q412986</a>
</td></tr></tbody></table>
</td></tr>
<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Eigenschaften
</th></tr>
<tr>
<td><a href="Molare_Masse" title="Molare Masse">Molare Masse</a>
</td>
<td>152,15 g·<a href="Mol" title="Mol">mol</a><sup>−1</sup>
</td></tr>
<tr>
<td><a href="Aggregatzustand" title="Aggregatzustand">Aggregatzustand</a>
</td>
<td>
<p>fest
</p>
</td></tr>
<tr>
<td><a href="Schmelzpunkt" title="Schmelzpunkt">Schmelzpunkt</a>
</td>
<td>
<p>113–115 <a href="Grad_Celsius" title="Grad Celsius">°C</a><sup id="cite_ref-Sigma_2-0" class="reference"><a href="#cite_note-Sigma-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
<tr>
<td><a href="Siedepunkt" title="Siedepunkt">Siedepunkt</a>
</td>
<td>
<p>179 °C (15 <a href="MmHg" class="mw-redirect" title="MmHg">mmHg</a>; ≈ 20 <a href="Hektopascal" class="mw-redirect" title="Hektopascal">hPa</a>)<sup id="cite_ref-Sigma_2-1" class="reference"><a href="#cite_note-Sigma-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
<tr>
<td><a href="PKs-Wert" class="mw-redirect" title="PKs-Wert">p<i>K</i><sub>S</sub>-Wert</a>
</td>
<td>
<p>8,89 (25 °C)<sup id="cite_ref-CRC_3-0" class="reference"><a href="#cite_note-CRC-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
<tr>
<td><a href="L%C3%B6slichkeit" title="Löslichkeit">Löslichkeit</a>
</td>
<td>
<p>in heißem Wasser leicht, in kaltem kaum löslich; sehr leicht löslich in <a href="Chloroform" title="Chloroform">Chloroform</a>, leicht in <a href="Ethanol" title="Ethanol">Ethanol</a>, <a href="Diethylether" title="Diethylether">Ether</a>, <a href="Methanol" title="Methanol">Methanol</a> und <a href="Eisessig" class="mw-redirect" title="Eisessig">Eisessig</a><sup id="cite_ref-MONATSHEFTE_1882_1-1" class="reference"><a href="#cite_note-MONATSHEFTE_1882-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Sicherheitshinweise
</th></tr>
<tr>
<td colspan="2">
<table cellspacing="0" cellpadding="2" style="width:100%;">
<tbody><tr>
<td colspan="2" style="text-align:center"><b><a href="Global_harmonisiertes_System_zur_Einstufung_und_Kennzeichnung_von_Chemikalien" title="Global harmonisiertes System zur Einstufung und Kennzeichnung von Chemikalien">GHS-Gefahrstoffkennzeichnung</a></b><sup id="cite_ref-Sigma_2-2" class="reference"><a href="#cite_note-Sigma-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
<table class="hintergrundfarbe-neutral" style="text-align:center; margin-left:auto; margin-right:auto; display:flex; justify-content:center;">
<tbody><tr>
<td><span typeof="mw:File"><a href="Global_harmonisiertes_System_zur_Einstufung_und_Kennzeichnung_von_Chemikalien#Übersicht:_EU-Gefahrensymbole,_UN/GHS-Gefahrenpiktogramme,_UN/ADR-Gefahrensymbole" title="07 – Achtung"></a></span>
</td></tr></tbody></table>
<p><b>Achtung</b>
</p>
</td></tr>
<tr>
<td rowspan="2" width="33%" style="border-top:1px #A7A7A7 dashed; border-right:1px #A7A7A7 dashed;"><a href="H-_und_P-S%C3%A4tze" title="H- und P-Sätze">H- und P-Sätze</a>
</td>
<td style="border-top:1px #A7A7A7 dashed;">H: <span title="Untervorlage eingebunden: H-Sätze"></span><a href="H-_und_P-S%C3%A4tze#H-Sätze" title="H- und P-Sätze"><span style="display:inline-block;"><span style="color:#ff5400; border-bottom:1px dotted #ff5400;" title="Verursacht Hautreizungen.">315</span></span></a>‐<a href="H-_und_P-S%C3%A4tze#H-Sätze" title="H- und P-Sätze"><span style="display:inline-block;"><span style="color:#ff5400; border-bottom:1px dotted #ff5400;" title="Verursacht schwere Augenreizung.">319</span></span></a>‐<a href="H-_und_P-S%C3%A4tze#H-Sätze" title="H- und P-Sätze"><span style="display:inline-block;"><span style="color:#ff5400; border-bottom:1px dotted #ff5400;" title="Kann die Atemwege reizen.">335</span></span></a>
</td></tr>
<tr>
<td style="border-top:1px #A7A7A7 dashed;">P: <span title="Untervorlage eingebunden: P-Sätze"></span><a href="H-_und_P-S%C3%A4tze#P-Sätze" title="H- und P-Sätze"><span style="display:inline-block;"><span style="color:#ff5400; border-bottom:1px dotted #ff5400;" title="Einatmen von Staub / Rauch / Gas / Nebel / Dampf / Aerosol vermeiden.">261</span></span></a>‐<a href="H-_und_P-S%C3%A4tze#P-Sätze" title="H- und P-Sätze"><span style="display:inline-block;"><span style="color:#ff5400; border-bottom:1px dotted #ff5400;" title="Bei Kontakt mit den Augen: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach Möglichkeit entfernen. Weiter spülen.
(Geänderter Text seit Inkraftreten der „8. Anpassung an den Technischen Fortschritt“ am 1. Februar 2018)">305+351+338</span></span></a><sup id="cite_ref-Sigma_2-3" class="reference"><a href="#cite_note-Sigma-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</td></tr>
</tbody></table>
</td></tr>
<tr>
<td colspan="2" style="background:#FFDEAD; color:#202122; font-size:80%; text-align:center; line-height:150%; padding:.25em;">Wenn nicht anders vermerkt, gelten die angegebenen Daten bei <a href="Standardbedingungen" title="Standardbedingungen">Standardbedingungen</a> (0 °C, 1000 hPa).
</td></tr></tbody></table><p><span class="editoronly" style="display:none;"></span>
</p><p><b>Isovanillin</b> (<i>3-Hydroxy-4-methoxybenzaldehyd</i>) ist eine <a href="Organische_Verbindung" class="mw-redirect" title="Organische Verbindung">organische chemische Verbindung</a> mit der Summenformel C<sub>8</sub>H<sub>8</sub>O<sub>3</sub>. Es ist ein <a href="Derivat_(Chemie)" title="Derivat (Chemie)">Derivat</a> des <a href="Benzaldehyd" title="Benzaldehyd">Benzaldehyds</a> mit einer zusätzlichen <a href="Hydroxygruppe" title="Hydroxygruppe">Hydroxy-</a> und einer <a href="Methoxygruppe" title="Methoxygruppe">Methoxygruppe</a>. Isovanillin ist ein nahezu geruchloses <a href="Isomer" class="mw-redirect" title="Isomer">Isomer</a> zum <a href="Vanillin" title="Vanillin">Vanillin</a>, von dem es sich nur durch die Stellung der Methoxygruppe unterscheidet. Es dient als Synthesebaustein und findet vor allem im Pharma-, Kosmetik-, Agrar- und Nahrungsmittelbereich Verwendung.
</p>
<div class="mw-heading mw-heading2"><h2 id="Geschichte_und_Vorkommen">Geschichte und Vorkommen</h2></div>
<p>Isovanillin wurde 1882 von <a href="Rudolf_Wegscheider" title="Rudolf Wegscheider">Rudolf Wegscheider</a> isoliert und charakterisiert.<sup id="cite_ref-MONATSHEFTE_1882_1-2" class="reference"><a href="#cite_note-MONATSHEFTE_1882-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Es kommt u. a. in <i>Mondia whitei</i><sup id="cite_ref-Mondia_2000_4-0" class="reference"><a href="#cite_note-Mondia_2000-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Mondia_2001_5-0" class="reference"><a href="#cite_note-Mondia_2001-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> und <a href="Maniok" title="Maniok">Maniok</a><sup id="cite_ref-Cassava_6-0" class="reference"><a href="#cite_note-Cassava-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> vor.
</p>
<div style="clear:left;"></div>
<div class="mw-heading mw-heading2"><h2 id="Gewinnung_und_Darstellung">Gewinnung und Darstellung</h2></div>
<div class="mw-heading mw-heading3"><h3 id="Natürliche_Quellen"><span id="Nat.C3.BCrliche_Quellen"></span>Natürliche Quellen</h3></div>
<p>Die Isolierung von Isovanillin geschieht entweder durch Extraktion mit verschiedenen Lösungsmitteln aber auch durch <a href="Wasserdampfdestillation" title="Wasserdampfdestillation">Wasserdampfdestillation</a> aus getrockneten Wurzeln der <i>Mondia whitei</i>.<sup id="cite_ref-Mondia_2000_4-1" class="reference"><a href="#cite_note-Mondia_2000-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Mondia_2001_5-1" class="reference"><a href="#cite_note-Mondia_2001-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Patent_DE102009046126_7-0" class="reference"><a href="#cite_note-Patent_DE102009046126-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Technische_Synthesen">Technische Synthesen</h3></div>
<p>Zur Darstellung sind zahlreiche Verfahren bekannt:<sup id="cite_ref-Patent_DE69507676T2_8-0" class="reference"><a href="#cite_note-Patent_DE69507676T2-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>
</p>
<ul><li><a href="Piperonal" title="Piperonal">Piperonal</a> (<i>3,4-(Methylendioxy)-benzaldehyd</i>) wird mit <a href="Natriummethanolat" title="Natriummethanolat">Natriummethanolat</a> in Gegenwart von <a href="Kupfer(I)-chlorid" title="Kupfer(I)-chlorid">Kupfer(I)-chlorid</a> in <a href="Dimethylformamid" title="Dimethylformamid">Dimethylformamid</a> umgesetzt.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Veratrumaldehyd" title="Veratrumaldehyd">Veratrumaldehyd</a> (<i>3,4-Dimethoxybenzaldehyd</i>) kann durch selektive Demethylierung mit <a href="Methionin" title="Methionin">Methionin</a> in <a href="Methansulfons%C3%A4ure" title="Methansulfonsäure">Methansulfonsäure</a> zu Isovanillin umgesetzt werden.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Die Reaktionszeiten sind lang und die Selektivität ist nicht sehr hoch.</li>
<li>Eine selektive O-Methylierung von <a href="Protocatechualdehyd" title="Protocatechualdehyd">Protocatechualdehyd</a> (<i>3,4-Dihydroxybenzaldehyd</i>) durch <a href="Methyliodid" class="mw-redirect" title="Methyliodid">Methyliodid</a> in Gegenwart von <a href="Natriumhydrid" title="Natriumhydrid">Natriumhydrid</a> in <a href="Dimethylsulfoxid" title="Dimethylsulfoxid">Dimethylsulfoxid</a> führt zu einer Ausbeute von etwa 65 % Isovanillin.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup></li>
<li>Eine <a href="Formylierung" title="Formylierung">Formylierung</a> von <a href="Guajacol" title="Guajacol">Guajacol</a> (<i>o-Methoxyphenol</i>), welches als Acetat geschützt ist, erfolgt mit <a href="(Dichlormethyl)methylether" title="(Dichlormethyl)methylether">Dichlormethoxymethan</a> in Gegenwart von <a href="Titantetrachlorid" class="mw-redirect" title="Titantetrachlorid">Titantetrachlorid</a> in <a href="Dichlormethan" title="Dichlormethan">Dichlormethan</a>. Der 3-Acetoxy-4-methoxybenzaldehyd wird anschließend mit <a href="NaOH" class="mw-redirect" title="NaOH">NaOH</a> hydrolysiert.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup></li>
<li>Isovanillin lässt sich in guter Ausbeute erhalten, indem man bei einem 3-Alkoxy-4-methoxybenzaldehyd mittels einer starken Säure selektiv in 3-Stellung die Alkylgruppe abspaltet, wobei die <a href="Alkoxygruppe" title="Alkoxygruppe">Alkoxygruppe</a> mindestens zwei Kohlenstoffatome enthält. Hierzu eignet sich u. a. <a href="Ethylvanillin" title="Ethylvanillin">Ethylvanillin</a> (<b>1</b>), welches mit <a href="Dimethylsulfat" title="Dimethylsulfat">Dimethylsulfat</a> zum 3-Ethoxy-4-methoxybenzaldehyd (<b>2</b>) methyliert wird. Anschließend wird mit Schwefelsäure selektiv der Ethylether <a href="Etherspaltung" title="Etherspaltung">gespalten</a>.<sup id="cite_ref-Patent_DE69507676T2_8-1" class="reference"><a href="#cite_note-Patent_DE69507676T2-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup></li></ul>
<dl><dd></dd></dl>
<div class="mw-heading mw-heading2"><h2 id="Eigenschaften">Eigenschaften</h2></div>
<div class="mw-heading mw-heading3"><h3 id="Physikalische_Eigenschaften">Physikalische Eigenschaften</h3></div>
<p>Isovanillin bildet schwach gelbliche glasglänzende Säulen<sup id="cite_ref-MONATSHEFTE_1882_1-3" class="reference"><a href="#cite_note-MONATSHEFTE_1882-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>, schmilzt bei 113–115 °C<sup id="cite_ref-Sigma_2-4" class="reference"><a href="#cite_note-Sigma-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> und siedet bei 179 °C bei <a href="Unterdruck" title="Unterdruck">Unterdruck</a> (15 <a href="MmHg" class="mw-redirect" title="MmHg">mmHg</a>; ≈ 20 <a href="Hektopascal" class="mw-redirect" title="Hektopascal">hPa</a>)<sup id="cite_ref-Sigma_2-5" class="reference"><a href="#cite_note-Sigma-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>. Es ist in heißem Wasser leicht, in kaltem kaum löslich; hingegen ist es leicht löslich in <a href="Chloroform" title="Chloroform">Chloroform</a>, <a href="Ethanol" title="Ethanol">Ethanol</a>, <a href="Diethylether" title="Diethylether">Ether</a>, <a href="Methanol" title="Methanol">Methanol</a> und <a href="Eisessig" class="mw-redirect" title="Eisessig">Eisessig</a>.<sup id="cite_ref-MONATSHEFTE_1882_1-4" class="reference"><a href="#cite_note-MONATSHEFTE_1882-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Es kristallisiert im <a href="Monoklines_Kristallsystem" title="Monoklines Kristallsystem">monoklinen Kristallsystem</a> in der <a href="Raumgruppe" title="Raumgruppe">Raumgruppe</a> <i>P</i>2<sub>1</sub>/<i>a</i> (Raumgruppen-Nr. 14, Stellung 3)<span style="display:none;">Vorlage:Raumgruppe/14.3</span><span class="editoronly" style="display:none;"></span> mit den <a href="Gitterparameter" title="Gitterparameter">Gitterparametern</a> <i>a</i> = 851,7 <a href="Pikometer" class="mw-redirect" title="Pikometer">pm</a>, <i>b</i> = 1338,0 pm, <i>c</i> = 639,0 pm, <i>β</i> = 97,21° und vier <a href="Formeleinheit" title="Formeleinheit">Formeleinheiten</a> pro <a href="Elementarzelle" title="Elementarzelle">Elementarzelle</a>.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Chemische_Eigenschaften">Chemische Eigenschaften</h3></div>
<p>Isovanillin leitet sich strukturell sowohl vom <a href="Benzaldehyd" title="Benzaldehyd">Benzaldehyd</a> als auch vom <a href="Guajacol" title="Guajacol">Guajacol</a> (<i>2-Methoxyphenol</i>) ab. Es unterscheidet sich als <a href="Isomer" class="mw-redirect" title="Isomer">Isomer</a> vom <a href="Vanillin" title="Vanillin">Vanillin</a> durch die Stellung der Methoxygruppe. Anstatt an Position 3 ist diese hier an Position 4 vorzufinden. Hydroxy- und Methoxygruppe tauschen im Vergleich zum Vanillin die Plätze. Im Gegensatz zum Vanillin ist es nahezu geruchlos.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup>
</p>
<dl><dd><table class="wikitable" style="text-align:center; font-size:90%">
<tbody><tr>
<td><span typeof="mw:File"></span></td>
<td><span typeof="mw:File"></span>
</td></tr>
<tr>
<td>Isovanillin</td>
<td>Vanillin
</td></tr></tbody></table></dd></dl>
<p>Es bildet mit einer wässrigen Lösung von <a href="Eisen(III)-chlorid" title="Eisen(III)-chlorid">Eisen(III)-chlorid</a> jedoch keine Färbung.<sup id="cite_ref-MONATSHEFTE_1882_1-5" class="reference"><a href="#cite_note-MONATSHEFTE_1882-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Der <a href="PKs-Wert" class="mw-redirect" title="PKs-Wert">pK<sub>s</sub>-Wert</a> der phenolischen OH-Gruppe beträgt 8,89 (25 °C).<sup id="cite_ref-CRC_3-1" class="reference"><a href="#cite_note-CRC-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Dieser Wert ist gegenüber dem Phenol mit 9,99<sup id="cite_ref-CRC_3-2" class="reference"><a href="#cite_note-CRC-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> niedriger; die elektronenziehende Aldehydgruppe erhöht durch ihren <a href="%E2%88%92M-Effekt" class="mw-redirect" title="−M-Effekt">−M-Effekt</a> die <a href="OH-Acidit%C3%A4t" title="OH-Acidität">OH-Acidität</a>; die phenolische OH-Bindung wird zunehmend polarisiert.
</p>
<div class="mw-heading mw-heading3"><h3 id="Biologische_Eigenschaften">Biologische Eigenschaften</h3></div>
<p>Isovanillin ist ein selektiver Inhibitor der <a href="Aldehydoxidase" title="Aldehydoxidase">Aldehydoxidase</a>. Es ist kein Substrat dieses Enzyms und wird von der <a href="Aldehyddehydrogenase" class="mw-redirect" title="Aldehyddehydrogenase">Aldehyddehydrogenase</a> zu Isovanillinsäure metabolisiert.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Panoutsopoulos_20-0" class="reference"><a href="#cite_note-Panoutsopoulos-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Strukturelle_Verwandte">Strukturelle Verwandte</h2></div>
<p><a href="Isovanillylalkohol" title="Isovanillylalkohol">Isovanillylalkohol</a> (<i>3-Hydroxy-4-methoxybenzylalkohol</i>) entsteht durch Reduktion von Isovanillin. <a href="Isovanillins%C3%A4ure" title="Isovanillinsäure">Isovanillinsäure</a> (<i>3-Hydroxy-4-methoxybenzoesäure</i>) entsteht durch Oxidation, z. B. auf enzymatischen Weg.<sup id="cite_ref-Panoutsopoulos_20-1" class="reference"><a href="#cite_note-Panoutsopoulos-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup>
</p>
<dl><dd><table class="wikitable" style="text-align:center; font-size:90%">
<tbody><tr>
<td><span typeof="mw:File"></span></td>
<td><span typeof="mw:File"></span></td>
<td><span typeof="mw:File"></span>
</td></tr>
<tr>
<td>Isovanillylalkohol</td>
<td>Isovanillin</td>
<td>Isovanillinsäure
</td></tr></tbody></table></dd></dl>
<p><a href="Isoethylvanillin" title="Isoethylvanillin">Isoethylvanillin</a> (<i>3-Hydroxy-4-<u>eth</u>oxybenzaldehyd</i>) ist ein struktureller Verwandter und unterscheidet sich vom Isovanillin, indem man die Methylgruppe gegen eine Ethylgruppe austauscht. Die Strukturanalogie entspricht der zwischen Vanillin und <a href="Ethylvanillin" title="Ethylvanillin">Ethylvanillin</a>.
</p><p><a href="Iso-Acetovanillon" title="Iso-Acetovanillon"><i>iso</i>-Acetovanillon</a> (<i>3-Hydroxy-4-methoxyacetophenon</i>) ist gleichfalls ein struktureller Verwandter und unterscheidet sich vom Isovanillin, indem man die <a href="Formylgruppe" class="mw-redirect" title="Formylgruppe">Formylgruppe</a> (<a href="Aldehydgruppe" class="mw-redirect" title="Aldehydgruppe">Aldehydgruppe</a>) gegen eine <a href="Acetylgruppe" title="Acetylgruppe">Acetylgruppe</a> austauscht. Die Strukturanalogie entspricht der zwischen Vanillin und <a href="Acetovanillon" class="mw-redirect" title="Acetovanillon">Acetovanillon</a>.
</p>
<dl><dd><table class="wikitable" style="text-align:center; font-size:90%">
<tbody><tr>
<td><span typeof="mw:File"></span></td>
<td><span typeof="mw:File"></span></td>
<td><span typeof="mw:File"></span>
</td></tr>
<tr>
<td>Isoethylvanillin</td>
<td>Isovanillin</td>
<td><i>iso</i>-Acetovanillon
</td></tr></tbody></table></dd></dl>
<div class="mw-heading mw-heading2"><h2 id="Verwendung">Verwendung</h2></div>
<p>Isovanillin dient als Synthesebaustein vor allem im Pharma-, Kosmetik-, Agrar- und Nahrungsmittelbereich.<sup id="cite_ref-Patent_DE69507676T2_8-2" class="reference"><a href="#cite_note-Patent_DE69507676T2-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-MONATSHEFTE_1882-1"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-MONATSHEFTE_1882_1-0">a</a></sup> <sup><a href="#cite_ref-MONATSHEFTE_1882_1-1">b</a></sup> <sup><a href="#cite_ref-MONATSHEFTE_1882_1-2">c</a></sup> <sup><a href="#cite_ref-MONATSHEFTE_1882_1-3">d</a></sup> <sup><a href="#cite_ref-MONATSHEFTE_1882_1-4">e</a></sup> <sup><a href="#cite_ref-MONATSHEFTE_1882_1-5">f</a></sup></span> <span class="reference-text">Rudolf Wegscheider: "Über Isovanillin", in: <i><a href="Monatshefte_f%C3%BCr_Chemie" title="Monatshefte für Chemie">Monatshefte für Chemie</a></i>, <b>1882</b>, <i>3</i> (1), S. 789–795 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1007/BF01516846">10.1007/BF01516846</a></span>).</span>
</li>
<li id="cite_note-Sigma-2"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Sigma_2-0">a</a></sup> <sup><a href="#cite_ref-Sigma_2-1">b</a></sup> <sup><a href="#cite_ref-Sigma_2-2">c</a></sup> <sup><a href="#cite_ref-Sigma_2-3">d</a></sup> <sup><a href="#cite_ref-Sigma_2-4">e</a></sup> <sup><a href="#cite_ref-Sigma_2-5">f</a></sup></span> <span class="reference-text">Datenblatt <span style="font-style:italic;"><a rel="nofollow" class="external text" href="https://www.sigmaaldrich.com/catalog/product/ALDRICH/143685">3-Hydroxy-4-methoxybenzaldehyde</a></span> bei <a href="Sigma-Aldrich" title="Sigma-Aldrich">Sigma-Aldrich</a>, abgerufen am 31. Januar 2013 (<a rel="nofollow" class="external text" href="https://www.sigmaaldrich.com/DE/de/sds/ALDRICH/143685?userType=anonymous">PDF</a>).<span class="editoronly" style="display:none;"></span></span>
</li>
<li id="cite_note-CRC-3"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-CRC_3-0">a</a></sup> <sup><a href="#cite_ref-CRC_3-1">b</a></sup> <sup><a href="#cite_ref-CRC_3-2">c</a></sup></span> <span class="reference-text"><i><a href="CRC_Handbook_of_Tables_for_Organic_Compound_Identification" title="CRC Handbook of Tables for Organic Compound Identification">CRC Handbook of Tables for Organic Compound Identification</a></i>, Third Edition, 1984, ISBN 0-8493-0303-6, S. 434, Nr. 54.</span>
</li>
<li id="cite_note-Mondia_2000-4"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Mondia_2000_4-0">a</a></sup> <sup><a href="#cite_ref-Mondia_2000_4-1">b</a></sup></span> <span class="reference-text">Neil A. Koorbanally, Dulcie A. Mulholland, Neil R. Crouch: "Isolation of Isovanillin from Aromatic Roots of the Medicinal African Liane, <i>Mondia whitei</i>", in: <i>Journal of Herbs, Spices & Medicinal Plants</i>, <b>2000</b>, <i>7</i> (3), S. 37–43 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1300/J044v07n03_05">10.1300/J044v07n03_05</a></span>).</span>
</li>
<li id="cite_note-Mondia_2001-5"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Mondia_2001_5-0">a</a></sup> <sup><a href="#cite_ref-Mondia_2001_5-1">b</a></sup></span> <span class="reference-text">Kavaka W. Mukonyi, Isaiah O. Ndiege: "2-Hydroxy-4-methoxybenzaldehyde: Aromatic Taste Modifying Compound from <i>Mondia whytei Skeels</i>", in: <i>Bull. Chem. Soc. Ethiop.</i>, <b>2001</b>, <i>15</i> (2), S. 137–141 (<a rel="nofollow" class="external text" href="http://www.ajol.info/index.php/bcse/article/viewFile/20959/3903">PDF</a>).</span>
</li>
<li id="cite_note-Cassava-6"><span class="mw-cite-backlink"><a href="#cite_ref-Cassava_6-0">↑</a></span> <span class="reference-text">Bo Yi, Lifei Hu, Wenli Mei, Kaibing Zhou, Hui Wang, Ying Luo, Xiaoyi Wei, Haofu Dai: "Antioxidant Phenolic Compounds of Cassava (<i>Manihot esculenta</i>) from Hainan", in: <i><a href="Molecules" title="Molecules">Molecules</a></i>, <b>2010</b>, <i>16</i>, S. 10157–10167 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.3390/molecules161210157">10.3390/molecules161210157</a></span>; <a rel="nofollow" class="external text" href="http://www.mdpi.com/1420-3049/16/12/10157/pdf">PDF</a>).</span>
</li>
<li id="cite_note-Patent_DE102009046126-7"><span class="mw-cite-backlink"><a href="#cite_ref-Patent_DE102009046126_7-0">↑</a></span> <span class="reference-text"><span class="cite">Patentanmeldung <a rel="nofollow" class="external text" href="https://worldwide.espacenet.com/publicationDetails/biblio?locale=de_EP&CC=DE&NR=102009046126A1&FT=D&KC=A1">DE102009046126A1</a>: <i>Oral konsumierbare Zubereitung umfassend Wurzelextrakt aus Mondia whitei.</i> Angemeldet am <span style="white-space:nowrap;">28. Oktober 2009</span>, veröffentlicht am <span style="white-space:nowrap;">12. Mai 2011</span>, Anmelder: Symrise AG, Erfinder: Jakob Peter Ley et al.</span><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Apatent&rft_id=DE102009046126A1&rft.applcc=DE&rft.title=Oral+konsumierbare+Zubereitung+umfassend+Wurzelextrakt+aus+Mondia+whitei&rft.inventor=Jakob+Peter+Ley+et+al&rft.assignee=Symrise+AG&rft.appldate=2009-10-28&rft.pubdate=2011-05-12"></span></span>
</li>
<li id="cite_note-Patent_DE69507676T2-8"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Patent_DE69507676T2_8-0">a</a></sup> <sup><a href="#cite_ref-Patent_DE69507676T2_8-1">b</a></sup> <sup><a href="#cite_ref-Patent_DE69507676T2_8-2">c</a></sup></span> <span class="reference-text"><span class="cite">Patent <a rel="nofollow" class="external text" href="https://worldwide.espacenet.com/publicationDetails/biblio?locale=de_EP&CC=DE&NR=69507676T2&FT=D&KC=T2">DE69507676T2</a>: <i>Verfahren zur Herstellung von Isovanillin.</i> Angemeldet am <span style="white-space:nowrap;">20. Oktober 1995</span>, veröffentlicht am <span style="white-space:nowrap;">29. Juli 1999</span>, Anmelder: Rhone Poulenc Chimie, Erfinder: Christian Maliverney.</span><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Apatent&rft_id=DE69507676T2&rft.applcc=DE&rft.title=Verfahren+zur+Herstellung+von+Isovanillin&rft.inventor=Christian+Maliverney&rft.assignee=Rhone+Poulenc+Chimie&rft.appldate=1995-10-20&rft.pubdate=1999-07-29"></span></span>
</li>
<li id="cite_note-9"><span class="mw-cite-backlink"><a href="#cite_ref-9">↑</a></span> <span class="reference-text">N. Yu. Baratov, V. I. Vinogradova, M. S. Yunusov (Inst. Khim. Rastit. Veshchestv, Tashkent, USSR): "Reaction of 3,4-methylenedioxybenzaldehydes with sodium methoxide", in: <i><a href="Zh._Org._Khim." class="mw-redirect" title="Zh. Org. Khim.">Zh. Org. Khim.</a></i>, <b>1991</b>, <i>27</i> (7), S. 1578–1579.</span>
</li>
<li id="cite_note-10"><span class="mw-cite-backlink"><a href="#cite_ref-10">↑</a></span> <span class="reference-text">Nobutaka Fujii, Hiroshi Irie, Haruaki Yajima: "Regioselective Cleavage of Aromatic Methyl Ethers by Methanesulphonic Acid in the Presence of Methionine", in: <i><a href="J._Chem._Soc.%2C_Perkin_Trans._1" class="mw-redirect" title="J. Chem. Soc., Perkin Trans. 1">J. Chem. Soc., Perkin Trans. 1</a></i>, <b>1977</b>, <i>20</i>, S. 2288–2288 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1039/P19770002288">10.1039/P19770002288</a></span>).</span>
</li>
<li id="cite_note-11"><span class="mw-cite-backlink"><a href="#cite_ref-11">↑</a></span> <span class="reference-text">Satinder V. Kessar, Yash P. Gupta, Taj Mohammed, (Miss) Manju Goyal, Kewal K. Sawal: "Regioselective Mono-<i>O</i>-alkylation of some Pyrocatechoxide Dianions", in: <i><a href="J._Chem._Soc.%2C_Chem._Commun." class="mw-redirect" title="J. Chem. Soc., Chem. Commun.">J. Chem. Soc., Chem. Commun.</a></i>, <b>1983</b>, <i>7</i>, S. 400–401 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1039/C39830000400">10.1039/C39830000400</a></span>).</span>
</li>
<li id="cite_note-12"><span class="mw-cite-backlink"><a href="#cite_ref-12">↑</a></span> <span class="reference-text">Maria Luisa Scarpati, Armandodoriano Bianco, Livia Mascitelli, Pietro Passacantilli: "Selective Formylation of Diphenols", in: <i><a href="Synth._Commun." class="mw-redirect" title="Synth. Commun.">Synth. Commun.</a></i>, <b>1990</b>, <i>20</i> (17), S. 2565–2572 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1080/00397919008051462">10.1080/00397919008051462</a></span>).</span>
</li>
<li id="cite_note-13"><span class="mw-cite-backlink"><a href="#cite_ref-13">↑</a></span> <span class="reference-text">Fujiko Iwasaki: "The Crystal Structure of 3-Hydroxy-4-methoxybenzaldehyde (Isovanillin)", in: <i><a href="Chemistry_Letters" title="Chemistry Letters">Chemistry Letters</a></i>, <b>1973</b>, <i>2</i> (3), S. 227–228 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1246/cl.1973.227">10.1246/cl.1973.227</a></span>; <a rel="nofollow" class="external text" href="http://www.jstage.jst.go.jp/article/cl1972/2/3/2_3_227/_pdf">PDF</a>).</span>
</li>
<li id="cite_note-14"><span class="mw-cite-backlink"><a href="#cite_ref-14">↑</a></span> <span class="reference-text">Toru Egawa, Akiyo Kameyama, Hiroshi Takeuchi: "Structural determination of vanillin, isovanillin and ethylvanillin by means of gas electron diffraction and theoretical calculations", in: <i><a href="Journal_of_Molecular_Structure" title="Journal of Molecular Structure">Journal of Molecular Structure</a></i>, <b>2006</b>, <i>794</i> (1–3), S. 92–102 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1016/j.molstruc.2006.01.042">10.1016/j.molstruc.2006.01.042</a></span>; <a rel="nofollow" class="external text" href="http://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/14773/1/JMS794-1-3.pdf">PDF</a>).</span>
</li>
<li id="cite_note-15"><span class="mw-cite-backlink"><a href="#cite_ref-15">↑</a></span> <span class="reference-text">Riechstofflexikon: <a rel="nofollow" class="external text" href="http://www.chemikalienlexikon.de/aroinfo/0541-aro.htm"><i>Vanillin</i></a>.</span>
</li>
<li id="cite_note-16"><span class="mw-cite-backlink"><a href="#cite_ref-16">↑</a></span> <span class="reference-text">Georgios I. Panoutsopoulos, Christine Beedham: <i>Enzymatic oxidation of phthalazine with guinea pig liver aldehyde oxidase and liver slices: inhibition by isovanillin</i>. In: <i>Acta Biochimica Polonica</i>, <b>2004</b>, <i>51</i> (4), S. 943–951 (<a class="external mw-magiclink-pmid" rel="nofollow" href="https://www.ncbi.nlm.nih.gov/pubmed/15625566?dopt=Abstract">PMID 15625566</a>; <a rel="nofollow" class="external text" href="http://www.actabp.pl/pdf/4_2004/943.pdf">PDF</a>).</span>
</li>
<li id="cite_note-17"><span class="mw-cite-backlink"><a href="#cite_ref-17">↑</a></span> <span class="reference-text">Georgios I. Panoutsopoulos, Demetrios Kouretas, Christine Beedham: <i>Contribution of Aldehyde Oxidase, Xanthine Oxidase, and Aldehyde Dehydrogenase on the Oxidation of Aromatic Aldehydes</i>. In: <i><a href="Chemical_Research_in_Toxicology" title="Chemical Research in Toxicology">Chemical Research in Toxicology</a></i>, <b>2004</b>, <i>17</i> (10), S. 1368–1376 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1021/tx030059u">10.1021/tx030059u</a></span>; <a class="external mw-magiclink-pmid" rel="nofollow" href="https://www.ncbi.nlm.nih.gov/pubmed/15487898?dopt=Abstract">PMID 15487898</a>).</span>
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<li id="cite_note-18"><span class="mw-cite-backlink"><a href="#cite_ref-18">↑</a></span> <span class="reference-text">Georgios I. Panoutsopoulos: <i>Phenylacetaldehyde oxidation by freshly prepared and cryopreserved guinea pig liver slices: the role of aldehyde oxidase</i>. In: <i><a href="International_Journal_of_Toxicology" title="International Journal of Toxicology">International Journal of Toxicology</a></i>, <b>2005</b>, <i>24</i> (2), S. 103–109 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1080/10915810590936373">10.1080/10915810590936373</a></span>; <a class="external mw-magiclink-pmid" rel="nofollow" href="https://www.ncbi.nlm.nih.gov/pubmed/16036769?dopt=Abstract">PMID 16036769</a>).</span>
</li>
<li id="cite_note-19"><span class="mw-cite-backlink"><a href="#cite_ref-19">↑</a></span> <span class="reference-text">Georgios I. Panoutsopoulos, Christine Beedham: <i>Metabolism of isovanillin by aldehyde oxidase, xanthine oxidase, aldehyde dehydrogenase and liver slices</i>. In: <i><a href="Pharmacology" title="Pharmacology">Pharmacology</a></i>, <b>2005</b>, <i>73</i> (4), S. 199–208 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1159/000082860">10.1159/000082860</a></span>; <a class="external mw-magiclink-pmid" rel="nofollow" href="https://www.ncbi.nlm.nih.gov/pubmed/15627845?dopt=Abstract">PMID 15627845</a>).</span>
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<li id="cite_note-Panoutsopoulos-20"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Panoutsopoulos_20-0">a</a></sup> <sup><a href="#cite_ref-Panoutsopoulos_20-1">b</a></sup></span> <span class="reference-text">Georgios I. Panoutsopoulos, Christine Beedham: "Enzymatic Oxidation of Vanillin, Isovanillin and Protocatechuic Aldehyde with Freshly Prepared Guinea Pig Liver Slices", in: <i><a href="Cell_Physiol_Biochem" class="mw-redirect" title="Cell Physiol Biochem">Cell Physiol Biochem</a></i>, <b>2005</b>, <i>15</i> (1–4), S. 89–98 (<a class="external mw-magiclink-pmid" rel="nofollow" href="https://www.ncbi.nlm.nih.gov/pubmed/15665519?dopt=Abstract">PMID 15665519</a>; <a rel="nofollow" class="external text" href="http://content.karger.com/produktedb/produkte.asp?typ=fulltext&file=CPB20050151_4089">PDF</a>).</span>
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<li id="cite_note-21"><span class="mw-cite-backlink"><a href="#cite_ref-21">↑</a></span> <span class="reference-text">Keng-Shiang Huang, Eng-Chi Wang: "Synthesis of Substituted Indenes from Isovanillin via Claisen Rearrangement and Ring-closing Metathesis", in: <i><a href="Journal_of_the_Chinese_Chemical_Society" title="Journal of the Chinese Chemical Society">Journal of the Chinese Chemical Society</a></i>, <b>2004</b>, <i>51</i>, S. 383–391 (<a href="https://doi.org/10.1002/jccs.200400060" class="extiw external" title="doi:10.1002/jccs.200400060">doi:10.1002/jccs.200400060</a>).</span>
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<li id="cite_note-22"><span class="mw-cite-backlink"><a href="#cite_ref-22">↑</a></span> <span class="reference-text">Sie-Rong Li, Chung-Jung Shu, Liang-Yeu Chen, Hsing-Ming Chen, Po-Yuan Chen, Eng-Chi Wang: "Synthesis of substituted 2-aroyl-3-methylchromen-4-ones from isovanillin via 2-aroyl-3-methylchroman intermediates", in: <i><a href="Tetrahedron" title="Tetrahedron">Tetrahedron</a></i>, <b>2009</b>, <i>65</i> (42), S. 8702–8707 (<a href="https://doi.org/10.1016/j.tet.2009.08.043" class="extiw external" title="doi:10.1016/j.tet.2009.08.043">doi:10.1016/j.tet.2009.08.043</a>).</span>
</li>
<li id="cite_note-23"><span class="mw-cite-backlink"><a href="#cite_ref-23">↑</a></span> <span class="reference-text">Roger M. Davey, N. Patrick J. Stamford: "Catalytic enamines from dialkylamide-dialkylacetals", in: <i><a href="Tetrahedron_Letters" title="Tetrahedron Letters">Tetrahedron Letters</a></i>, <b>2012</b>, <i>53</i> (20), S. 2537–2539 (<a href="https://doi.org/10.1016/j.tetlet.2012.03.028" class="extiw external" title="doi:10.1016/j.tetlet.2012.03.028">doi:10.1016/j.tetlet.2012.03.028</a>).</span>
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</ol>
<div class="mw-heading mw-heading2"><h2 id="Literatur">Literatur</h2></div>
<ul><li>R. H. Prager, Y. T. Tan: "Selective demethylation of 3,4-dimethoxybenzaldehyde", in: <i><a href="Tetrahedron_Letters" title="Tetrahedron Letters">Tetrahedron Letters</a></i>, <b>1967</b>, <i>8</i> (38), S. 3661–3664 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1016/S0040-4039%2801%2989768-9">10.1016/S0040-4039(01)89768-9</a></span>).</li>
<li>V. Balachandran, K. Parimala: "Vanillin and isovanillin: Comparative vibrational spectroscopic studies, conformational stability and NLO properties by density functional theory calculations", in: <i><a href="Spectrochimica_Acta_Part_A%3A_Molecular_and_Biomolecular_Spectroscopy" class="mw-redirect" title="Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy">Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy</a></i>, <b>2012</b>, <i>95</i>, S. 354–368 (<a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1016/j.saa.2012.03.087">10.1016/j.saa.2012.03.087</a></span>; <a class="external mw-magiclink-pmid" rel="nofollow" href="https://www.ncbi.nlm.nih.gov/pubmed/22542395?dopt=Abstract">PMID 22542395</a>).</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Weblinks">Weblinks</h2></div>
<ul><li>Eintrag zu <span style="font-style:italic;"><a rel="nofollow" class="external text" href="http://webbook.nist.gov/cgi/cbook.cgi?ID=C621-59-0">Isovanillin</a></span>. In: P. J. Linstrom, W. G. Mallard (Hrsg.): <i>NIST Chemistry WebBook, NIST Standard Reference Database Number 69</i>. <a href="National_Institute_of_Standards_and_Technology" title="National Institute of Standards and Technology">National Institute of Standards and Technology</a>, Gaithersburg MD, abgerufen am 1. November 2012.<span class="editoronly" style="display:none;"></span></li>
<li>NMRanalyst Sample Application: <a rel="nofollow" class="external text" href="http://www.sciencesoft.net/isovanillin/index.html"><i>Isovanillin</i></a>.</li></ul></div><!--htdig_noindex--><div><div class="zim-footer">
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