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13C n.m.r. spectra of some thiobenzamides. Correlation between 13C and 1H n.m.r. spectra and signal assignments of syn and anti CH2 groups

✍ Scribed by C. Piccinni-Leopardi; O. Fabre; D. Zimmermann; J. Reisse; F. Cornea; C. Fulea

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
254 KB
Volume
8
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

^13^C n.m.r. spectra of a series of N,N‐disubstituted thioamides have been recorded and signal assignments were performed. Separate signals are observed for methylene groups fixed on the nitrogen atom. Since the carbon atom syn to the thiocarbonyl sulfur resonates at higher field than the anti carbon, the syn‐anti assignment in ^1^H n.m.r. is easily obtained by selective double irradiation. This method, which is rapid and reliable, affords a rather general solution to the interesting problem of resonance assignments in tertiary amides and thioamides (and in analogous molecules such as oximes and nitrosamines).

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