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A

Anonymous

Nov 13, 2024

help with nomenclature of an alkane?

I need help with the nomenclature of an alkane. Specifically, I’m trying to figure out the number of ethyl and methyl groups in 4-sec-butyl-5-ethyl-3-methyloctane.

When I analyze the compound, it appears that the sec-butyl group contains one methyl group and one ethyl group. Additionally, at carbon 5, I see an ethyl group, and at carbon 3, there’s another methyl group. Based on my assessment, I counted two ethyl groups and two methyl groups, but that was incorrect.

I’m confused about how there could be more substituents. Could someone please help clarify this for me? Thank you!

2 Answers

A
Anonymous

Jan 09, 2025

The sec-butyl group has 2 methyl and 1 ethyl groups (there are duplicates), octane has a methyl group at each end and another on carbon 3. The ethyl group on C5 has a methyl group at its end as well.

It kinda depends on how you view these groups -- does octant have 2 ethyl groups in it?

4 ethyl

6 methyl

Not sure why the ethyl, but I know it is correct according to my saapling hw

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