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Long-range carbon–proton couplings in strychnine

✍ Scribed by Vratislav Blechta; Federico del Río-Portilla; Ray Freeman

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
367 KB
Volume
32
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Long‐range ^13^C,H NMR coupling constants were measured in strychnine at 400 MHz by a method that employs selective excitation of individual ^13^C sites under decoupled conditions followed by polarization transfer to protons. The sensitivity was improved by performing eight simultaneous soft‐pulse experiments coded (±) according to a Hadamard matrix and later separated by reference to the same matrix. The antiphase ^13^C,H splittings were measured by J‐doubling performed in the frequency domain.

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