Cycloalkene nomenclature?
Why is this 5-ethyl-3-methylcyclohexene and not 3-ethyl-5-methylcyclohexene when counting clockwise?
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Moin,
weil es gegen den Uhrzeigersinn
5-Ethyl-3-methylcyclohexen
ist, während es im Uhrzeigersinn gesehen
4-Ethyl-6-methylcyclohexen wäre.
Die Positionszahlen (3 / 5) sind kleiner als (4 / 6) und somit zu bevorzugen.
Das 5-Ethyl wird vor dem 3-Methyl genannt, weil E alphabetisch vor M kommt.
LG von der Waterkant
Die Doppelbindung muß die Atome 1 und 2 enthalten, also haben wir zwei Möglichkeiten, wie wir numerieren:
Wir nehmen die Version mit der kleinsten Lokante 3, also 5-Ethyl-3-methylcyclohexen.
Man gibt dabei den Kohlenstoffen der Doppelbindung die Lokanten 1 und 2. Wenn man das anwendet, dann hat man entweder 4-Ethyl-6-methyl… oder 5-Ethyl-3-methyl… Im zweiten Fall hat der Satz der Lokanten die kleinere Summe.