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Topic: 1H NMR signals  (Read 3593 times)

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Offline gabby90

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1H NMR signals
« on: July 16, 2013, 06:05:08 PM »
Im having trouble differentiating homotopic and heterotopics hydrogen. According to my solution manual 1-butyne would have 3 signals but how about the hydrogens on C2 wouldn't they be enantiotopic? if so, wouldn't it be 4 signals?

-Thanks in advance.
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Offline Dan

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Re: 1H NMR signals
« Reply #1 on: July 17, 2013, 03:54:41 AM »
Yes, they are enantiotopic - a question: Can enantiomers be distinguished by NMR?
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Offline gabby90

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Re: 1H NMR signals
« Reply #2 on: July 17, 2013, 12:45:45 PM »
I meant on carbon 3. Carbon 2 doesn't have any hydrogens. I understand there where there are two different groups on the carbon the hydrogens may be enantiotopics. How do i know when they are diasteotopics?
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Offline Dan

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Re: 1H NMR signals
« Reply #3 on: July 18, 2013, 03:04:18 AM »
Replacement of one of a pair of enantiotopic groups forms one of a pair of enantiomers.
Replacement of one of a pair of diastereotopic groups forms one of a pair of diastereomers.
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