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Topic: NMR help  (Read 2906 times)

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Offline pibonds

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NMR help
« on: May 03, 2009, 05:25:09 PM »
I have a somewhat complicated problem to solve for organic chemistry and I could really use some help. I have to find the structure of the aldol product of a ketone and aldehyde using the NMR data given to me. I have figured out some parts of the structure but am confused about others. Any help on getting the structure together will be appreciated. The info in parentheses is what I've figured out.

7.8 multiplet 4H (substituted benzene)
6.9 singlet 1H    (CH=C)
2.1 singlet 3H    (CH3)
1.9 triplet 2H     (CH2)
1.0 multiplet 8H (having trouble understanding what this and the next piece of info refer to)
.5 triplet 3H

The only hint I have been given is to assume that the aldol product is alpha beta unsaturated.

Thanks for your help

Offline sjb

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Re: NMR help
« Reply #1 on: May 04, 2009, 05:35:01 AM »
I don't know whether this would be considered working backwards, but do you know what the cross-aldol condensation between aldehyde and ketone gives?

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