Question on number 27?

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Question on number 27?

Postby Grace_Stevenson_1A » Wed Mar 15, 2017 10:10 am

Wouldn't 27 not be a correct name because you give priority to the functional groups?

Calvin Huang 3D
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Re: Question on number 27?

Postby Calvin Huang 3D » Wed Mar 15, 2017 1:24 pm

The naming is correct. Ketone is the functional group here and is given priority in that its suffix is attached onto the parent chain (in this case propane) at the 3rd carbon. You state the non functional groups first which is why the 2-dimethyl comes before the functional group. You will have 2 methyl groups attached to the 2nd carbon.

Mihika Sridhar 3H
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Re: Question on number 27?

Postby Mihika Sridhar 3H » Wed Mar 15, 2017 2:26 pm

I think Grace is asking why the ketone functional group has a lower carbon number than the methyl groups since we've learned that functional groups have the highest priority in carbon numbering. Why isn't it 4-dimethyl-3-pentanone instead?

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