Numbering

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Taylor_Lam_1E
Posts: 9
Joined: Wed Sep 21, 2016 1:58 pm

Numbering

Postby Taylor_Lam_1E » Sun Mar 19, 2017 9:16 am

When it comes to numbering alkanes, does it matter where you start? Like in question 5C on quiz 3, where it was a cyclobutane with ethyl and methyl substituents, what would be the 1 and what would be the 3?

Cherry_Deng_1K
Posts: 12
Joined: Wed Sep 21, 2016 1:55 pm

Re: Numbering

Postby Cherry_Deng_1K » Sun Mar 19, 2017 9:51 am

Hello,

It does matter where you start numbering the carbons. In this case, you would want to assign lower numbers alphabetically. Since E comes before M, you would assign the lower number to ethyl and the higher number to methyl. Therefore, the name of the hydrocarbon would be 1-ethyl-3-methyl cyclobutane.


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