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Carbon-13 and nitrogen-15 NMR spectra of some methanesulphonanilides

✍ Scribed by Mohammed I. M. Wazeer; Sk. Asrof Ali

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
524 KB
Volume
28
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^13^C and ^15^N NMR spectra of some ortho‐, meta‐ and para‐substituted methanesulphonanilides were recorded. Correlations of the ^13^C chemical shifts with the appropriate substituent chemical shifts (SCS) for monosubstituted benzenes were excellent and showed enhancement of the substituent effects at C‐1 (para to the substituent). The C‐1 chemical shifts were also examined by means of the dual substituent parameter (DSP) and DSP‐nonlinear resonance equations. The results indicate that the —NHSO~2~ Me moiety is a weak electron donor. The ^15^N chemical shifts of the para‐substituted compounds were analysed by means of DSP equations and the results compared with those of related compounds. Ortho‐substituted compounds indicate the high sensitivity of ^15^N chemical shifts towards steric compression. T~1~ and nuclear Overhauser enhancement data for the protonated carbons of methyl‐substituted compounds are given.

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