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Homework 1.12C naming

Posted: Sun Feb 28, 2016 6:43 pm
by AvaM1c
Hi, for naming CH3CHC(CH3)C(CH3)3 I named it 2-2-3-trimethyl-3-pentene but the book answer has it as 3-4-4-trimethyl-2-pentene. Can someone please explain why my answer is wrong?

Re: Homework 1.12C naming

Posted: Sun Feb 28, 2016 9:56 pm
by Courtnie Ly
I got the same answer that you did, perhaps it's because you want to get the lowest number possible for the pentene? (2 instead of 3)

Re: Homework 1.12C naming

Posted: Mon Feb 29, 2016 12:50 pm
by Jeannie Huang 3B
Yup, you want to give the double bond priority in numbering. So give it the lowest number first.

In numbering, the priority goes as follows:
1. functional groups like --OH or carboxylic acid
2. double or triple bonds
3. other substituent groups

Try to give #1 and #2 the lowest numbers first before proceeding with other substituent groups.