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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Pregnan</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">
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<th colspan="2" style="background:#FFDEAD; color:#202122;">Strukturformel
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<td colspan="2" class="hintergrundfarbe-basis skin-invert-image" style="text-align:center;"><span typeof="mw:File"></span>
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<th colspan="2" style="background:#FFDEAD; color:#202122;">Allgemeines
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<td style="width:33%;">Name
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<td>Pregnan
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<td>Andere Namen
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<ul><li>10<i>β</i>,13<i>β</i>-Dimethyl-17<i>β</i>-ethylgonan</li>
<li>17<i>β</i>-Ethylandrostan</li></ul>
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<td><a href="Summenformel" title="Summenformel">Summenformel</a>
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<td>C<sub>21</sub>H<sub>36</sub>
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<td>Kurzbeschreibung
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<p>farblose Schuppen<sup id="cite_ref-ABC_Chemie_1-0" class="reference"><a href="#cite_note-ABC_Chemie-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
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<th colspan="2" style="background:#FFDEAD; color:#202122;">Externe Identifikatoren/Datenbanken
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<table class="mw-collapsible mw-collapsed wikitable" data-expandtext="+" data-collapsetext="−" style="border-top:none; margin:-1px; width:calc(100% + 2px);">
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<td style="width:33%;"><a href="CAS-Nummer" title="CAS-Nummer">CAS-Nummer</a>
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<ul><li><span title="Untervorlage eingebunden: CASRN"></span><a rel="nofollow" class="external text" href="https://commonchemistry.cas.org/detail?cas_rn=24909-91-9">24909-91-9</a><span class="editoronly" style="display:none;"></span></li>
<li><span title="Untervorlage eingebunden: CASRN"></span><a rel="nofollow" class="external text" href="https://commonchemistry.cas.org/detail?cas_rn=641-85-0">641-85-0</a><span class="editoronly" style="display:none;"></span> (5<i>α</i>-Pregnan)</li>
<li><span title="Untervorlage eingebunden: CASRN"></span><a rel="nofollow" class="external text" href="https://commonchemistry.cas.org/detail?cas_rn=481-26-5">481-26-5</a><span class="editoronly" style="display:none;"></span> (5<i>β</i>-Pregnan)</li></ul>
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<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/6857422">6857422</a>
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<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.5256760.html">5256760</a>
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<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/Q2700511" class="extiw external" title="d:Q2700511">Q2700511</a>
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<th colspan="2" style="background:#FFDEAD; color:#202122;">Eigenschaften
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<td><a href="Molare_Masse" title="Molare Masse">Molare Masse</a>
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<td>288,51 g·<a href="Mol" title="Mol">mol</a><sup>−1</sup>
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<td><a href="Aggregatzustand" title="Aggregatzustand">Aggregatzustand</a>
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<p>fest<sup id="cite_ref-ABC_Chemie_1-1" class="reference"><a href="#cite_note-ABC_Chemie-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
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<td><a href="Schmelzpunkt" title="Schmelzpunkt">Schmelzpunkt</a>
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<p>83,5<a href="Grad_Celsius" title="Grad Celsius">°C</a><sup id="cite_ref-ABC_Chemie_1-2" class="reference"><a href="#cite_note-ABC_Chemie-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
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<th colspan="2" style="background:#FFDEAD; color:#202122;">Sicherheitshinweise
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<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><br><i>keine Einstufung verfügbar</i><sup id="cite_ref-NV_2-0" class="reference"><a href="#cite_note-NV-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
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<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>Pregnan</b> ist die Bezeichnung für eine <a href="Chemische_Verbindung" title="Chemische Verbindung">chemische Verbindung</a> aus der Gruppe der <a href="Polycyclische_Verbindungen" class="mw-redirect" title="Polycyclische Verbindungen">polycyclischen Kohlenwasserstoffe</a>.
</p><p>Es handelt sich um ein <a href="Sterane" title="Sterane">Steran</a>, bestehend aus einem tetracyclischen Grundgerüst mit drei <a href="Anellierung" title="Anellierung">anellierten</a> Cyclohexanringen und einem anellierten Cyclopentanring. Es unterscheidet sich vom <a href="Gonan" class="mw-redirect" title="Gonan">Gonan</a> durch zwei zusätzliche <a href="Methylgruppe" title="Methylgruppe">Methylgruppen</a> und eine <a href="Ethylgruppe" title="Ethylgruppe">Ethylgruppe</a>. Es gibt zwei unterschiedliche Pregnane, die sich in der Stereochemie an der 5-Position unterscheiden und als 5<i>α</i>-Pregnan und 5<i>β</i>-Pregnan bezeichnet werden:
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<ul class="center centered gallery mw-gallery-traditional">
<li class="gallerybox" style="width: 235px">
<div class="thumb" style="width: 230px; height: 150px;"><span typeof="mw:File"></span></div>
<div class="gallerytext">5<i>α</i>-Pregnan </div>
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<li class="gallerybox" style="width: 235px">
<div class="thumb" style="width: 230px; height: 150px;"><span typeof="mw:File"></span></div>
<div class="gallerytext">5<i>β</i>-Pregnan </div>
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<p>Vom 5<i>β</i>-Pregnan leiten sich unter anderem das Pregnandion, <a href="Pregnenolon" title="Pregnenolon">Pregnenolon</a> und <a href="Pregnandiol" title="Pregnandiol">Pregnandiol</a> ab.
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<div class="mw-heading mw-heading2"><h2 id="Weblinks">Weblinks</h2></div>
<div class="sisterproject" style="margin:0.1em 0 0 0;"><div class="noresize noviewer" style="display:inline-block; line-height:10px; min-width:1.6em; text-align:center;" aria-hidden="true" role="presentation"><span class="mw-default-size" typeof="mw:File"><span title="Commons"></span></span></div><b><span class=""><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Pregnane?uselang=de"><span lang="en">Commons</span>: Pregnan</a></span></b> – Sammlung von Bildern, Videos und Audiodateien</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=C481-26-5">Pregnan</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<span class="editoronly" style="display:none;"></span></li></ul>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-ABC_Chemie-1"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-ABC_Chemie_1-0">a</a></sup> <sup><a href="#cite_ref-ABC_Chemie_1-1">b</a></sup> <sup><a href="#cite_ref-ABC_Chemie_1-2">c</a></sup></span> <span class="reference-text"><i>Brockhaus ABC Chemie</i>, VEB F. A. Brockhaus Verlag Leipzig 1965, S. 1133.</span>
</li>
<li id="cite_note-NV-2"><span class="mw-cite-backlink"><a href="#cite_ref-NV_2-0">↑</a></span> <span class="reference-text">Dieser Stoff wurde in Bezug auf seine Gefährlichkeit entweder noch nicht eingestuft oder eine verlässliche und zitierfähige Quelle hierzu wurde noch nicht gefunden.</span>
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