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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Stammsystem</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"><p>Ein <b>Stammsystem</b> (auch <i>Grundstruktur</i>, <i>Stammstruktur</i>) wird als Ausgangsmolekül für die chemische <a href="Nomenklatur_(Chemie)" title="Nomenklatur (Chemie)">Nomenklatur</a> benötigt. Im Allgemeinen wird als Stammsystem ein <i>Stammhydrid</i> verwendet, d. h. ein <a href="Molek%C3%BCl" title="Molekül">Molekül</a>, das nebst <a href="Wasserstoff" title="Wasserstoff">Wasserstoffatomen</a> mindestens eines oder mehrere miteinander gebundene weitere <a href="Atom" title="Atom">Atome</a> enthält. Es kann aber auch eine <i>Stammverbindung</i> eingesetzt werden, die bereits <a href="Funktionelle_Gruppe" title="Funktionelle Gruppe">funktionelle Gruppen</a> besitzt.<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>
</p><p>Der Name des Stammsystems wird durch verschiedene Operationen verändert:
</p>
<ul><li>Bei der <a href="Substitutive_Nomenklatur" title="Substitutive Nomenklatur">substitutiven</a> Operation werden eines oder mehrere Wasserstoffatome durch andere Atome oder Gruppen ersetzt.</li>
<li>Bei der <a href="Ersetzungsnomenklatur" title="Ersetzungsnomenklatur">Ersetzungsoperation</a> werden eines oder mehrere Nicht-Wasserstoffatome durch andere Atome ersetzt.</li>
<li>Bei der additiven Operation wird eine <a href="Chemische_Struktur" title="Chemische Struktur">Struktur</a> aus zwei oder mehreren anderen gebildet, ohne dass Atome verloren gehen.</li>
<li>Bei der subtraktiven Operation werden ein oder mehrere Atome entfernt.</li>
<li>Bei der konjunktiven Operation wird eine Struktur aus zwei oder mehreren gebildet, indem von jedem Stammsystem die gleiche Anzahl Wasserstoffatome entfernt werden.</li>
<li>Bei der multiplikativen Nomenklatur werden mehrere gleiche Strukturen an eine symmetrische, <a href="Bindigkeit" title="Bindigkeit">mehrbindige</a> Struktur gebunden.</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Abgrenzung">Abgrenzung</h2></div>
<p>Auch <a href="Derivat_(Chemie)" title="Derivat (Chemie)">Derivate</a> lassen sich von einer <i>Stammverbindung</i> ableiten. In dieser Bedeutung besitzt die Stammverbindung jedoch ähnliche funktionelle Gruppen und nicht notwendigerweise auch das gleiche Stammsystem.
</p>
<div class="mw-heading mw-heading2"><h2 id="Beispiele">Beispiele</h2></div>
<div class="mw-heading mw-heading3"><h3 id="Substitutive_Operation">Substitutive Operation</h3></div>
<p>Stammhydrid <i><a href="Silane" title="Silane">Silan</a></i> mit einem Silizium-Atom:
</p>
<div style="margin-left: 1.6em;"><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {H-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{Si}}}-H}}}">
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<annotation encoding="application/x-tex">{\displaystyle {\ce {H-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{Si}}}-H}}}</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/0dde55f278c6192b686ead805052485886a3439a.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.338ex; width:9.403ex; height:10.009ex;" alt="{\displaystyle {\mathrm {H} {-}{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {Si} }}}{-}\mathrm {H} }}" loading="lazy"></span><br></div>
<p>Vom Stammhydrid durch Ersetzen eines Wasserstoffatoms abgeleiteter Name <a href="Monochlorsilan" title="Monochlorsilan">Chlorsilan</a>:
</p>
<div style="margin-left: 1.6em;"><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {H-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{Si}}}-Cl}}}">
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<annotation encoding="application/x-tex">{\displaystyle {\ce {H-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{Si}}}-Cl}}}</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/1f6bec0b21f0631004eee8aeb308029cac777111.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.338ex; width:9.985ex; height:10.009ex;" alt="{\displaystyle {\mathrm {H} {-}{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {Si} }}}{-}\mathrm {Cl} }}" loading="lazy"></span><br></div>
<ul class="gallery mw-gallery-traditional">
<li class="gallerybox" style="width: 155px">
<div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"></span></div>
<div class="gallerytext">Stammverbindung <a href="Essigs%C3%A4ure" title="Essigsäure">Essigsäure</a></div>
</li>
<li class="gallerybox" style="width: 155px">
<div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"></span></div>
<div class="gallerytext">Von Essigsäure durch Substitution dreier Wasserstoffatome abgeleiteter Name <a href="Trifluoressigs%C3%A4ure" title="Trifluoressigsäure">Trifluoressigsäure</a></div>
</li>
</ul>
<div class="mw-heading mw-heading3"><h3 id="Subtraktive_Operation">Subtraktive Operation</h3></div>
<p>Stammhydrid <i><a href="Pentan" title="Pentan">Pentan</a></i> mit fünf Kohlenstoff-Atomen:
</p>
<div style="margin-left: 1.6em;"><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {H-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-H}}}">
<semantics>
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<annotation encoding="application/x-tex">{\displaystyle {\ce {H-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-H}}}</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/aaeb78075f4b1b664407ae74aa2f9961b768ccd2.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.338ex; width:25.838ex; height:10.009ex;" alt="{\displaystyle {\mathrm {H} {-}{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {C} }}}{-}~{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {C} }}}{-}~{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {C} }}}{-}~{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {C} }}}{-}~{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {C} }}}{-}\mathrm {H} }}" loading="lazy"></span><br></div>
<p>Vom Stammhydrid durch Entfernen zweier Wasserstoffatome abgeleiteter Name <a href="Pentene" title="Pentene">Pent-2-en</a>.
</p>
<div style="margin-left: 1.6em;"><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {H-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{C}}={\overset {\displaystyle H \atop |}{C}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-H}}}">
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<annotation encoding="application/x-tex">{\displaystyle {\ce {H-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{C}}={\overset {\displaystyle H \atop |}{C}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-H}}}</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/d54cd2a37bc4d83dd984940e374794d92ae9d95f.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.338ex; width:25.838ex; height:10.009ex;" alt="{\displaystyle {\mathrm {H} {-}{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {C} }}}{-}~{\overset {\displaystyle \mathrm {H} ~ \atop |}{\mathrm {C} }}{}={}{\overset {\displaystyle \mathrm {H} ~ \atop |}{\mathrm {C} }}{}-{}{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {C} }}}{-}~{\overset {\displaystyle \mathrm {H} ~ \atop |}{\underset {|~ \atop \displaystyle \mathrm {H} }{\mathrm {C} }}}{-}\mathrm {H} }}" loading="lazy"></span><br></div>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text">Henri A. Favre, Warren H. Powell (Hrsg.): <cite class="lang" lang="en" dir="auto" style="font-style:italic">Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013</cite>. Royal Soc. of Chemistry [u. a.], Cambridge 2014, ISBN 978-0-85404-182-4, Kapitel P-1 (englisch, <a rel="nofollow" class="external text" href="https://iupac.qmul.ac.uk/BlueBook/P1.html">qmul.ac.uk</a> [abgerufen am 22. Dezember 2024]).<span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abookitem&rfr_id=info:sid/de.wikipedia.org:Stammsystem&rft.atitle=Kapitel+P-1&rft.btitle=Nomenclature+of+Organic+Chemistry%3A+IUPAC+Recommendations+and+Preferred+Names+2013&rft.date=2014&rft.genre=bookitem&rft.isbn=9780854041824&rft.place=Cambridge&rft.pub=Royal+Soc.+of+Chemistry+%5Bu.+a.%5D" style="display:none"> </span></span>
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