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On the assignment of 13C resonances in unsymmetrical ortho-disubstituted benzene rings. 13C N.m.r. spectrum of Piroxicam

✍ Scribed by Earl B. Whipple

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
262 KB
Volume
10
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Characteristic differences in multiplet hyperfine structure observed in coupled ^13^C n.m.r. spectra of symmetrical o‐disubstituted benzene rings are explained on general grounds. Contrary to earlier proposals, the observation of this effect in unsymmetrical systems is not a suitable basis for corresponding ^13^C n.m.r. assignments unless the proton spectrum has been sufficiently analyzed. The ^13^C spectrum of piroxicam, an antiinflammatory agent, is assigned and some interesting relaxation properties are noted.

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