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Topic: determine Z or E using NMR  (Read 3874 times)

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Offline HB

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determine Z or E using NMR
« on: May 04, 2013, 04:23:00 PM »
how can I determine Z or E configuration of schiff bases using NMR
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Offline orgopete

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Re: determine Z or E using NMR
« Reply #1 on: May 04, 2013, 09:33:26 PM »
If disubstituted, check the coupling constants. They are quite different.
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Offline HB

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Re: determine Z or E using NMR
« Reply #2 on: May 05, 2013, 12:58:52 PM »
if the compound is the result of benzaldehyde and p-anisidine reaction, how can I apply that, what is the difference in coupling constants
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Offline Dan

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Re: determine Z or E using NMR
« Reply #3 on: May 05, 2013, 06:10:08 PM »
You cannot compare coupling constants for N-benzylideneanisidine - the imine H does not couple to anything. You need to look at through space interactions rather than through bond. Look up the nuclear Overhauser effect.
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