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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: ve_90 on March 23, 2025, 11:58:58 AM

Title: IUPAC name (cycloalkene)
Post by: ve_90 on March 23, 2025, 11:58:58 AM

According to IUPAC nomenclature, following the official rules, is the correct name of this cycloalkene: 3-chloro-4-methyl-1-cyclohexene or 3-chloro-4-methylcyclohexene? In other words, should the position of the double bond always be specified, or can it be omitted since the position of the double bond is implicit in the name and can be inferred from the positions of the substituents we indicate?

Title: Re: IUPAC name (cycloalkene)
Post by: Hunter2 on March 23, 2025, 02:56:08 PM

First it's not a cyclohexene, it's a cyclopentene.
The 1 at the doublebond is not necessary, because if the double bond is at other position the numbers for the substituents will also change.

https://pubchem.ncbi.nlm.nih.gov/compound/3S_-3-Chloro-4-methylcyclopentene