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Naming the Substituent on the First Carbon

Posted: Tue Mar 14, 2017 10:34 am
by Michelle Lin 3M
1-ethyl-2-methylcyclopropane

Based on this name, is the 1 at the beginning optional or necessary? Are there specific cases where the 1 is not optional?
I thought the 1 at the beginning was optional, but I was told otherwise.

Re: Naming the Substituent on the First Carbon

Posted: Tue Mar 14, 2017 10:41 am
by Hung_Sabrina_3N
Its not optional because in this case you have two substituents and by not labeling it with a 1, it is ambiguous where the ethyl is located.