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Numbering hydrocarbon branches

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Numbering hydrocarbon branches

Post  elefantsnablar on Thu Oct 25, 2012 4:55 pm

Hi all!

I've been given the alkene "3-ethyl-4-propylheptane". I found nothing wrong in the name, however, the 4-prefix (before propyl) is unnecessary since if the propyl would be sitting on ANY other carbon, the longest carbon chain would change and it would no longer be a heptane.

My question is, is "3-ethylpropylheptane" a legit name, or must I number all branches if I've numbered one?

Grateful for all responses, thanks!

elefantsnablar

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