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NMR studies of sulphur heterocycles: III—13C spectra of benzo[b]thiophene and the methylbenzo[b]thiophenes

✍ Scribed by P. D. Clark; D. F. Ewing; R. M. Scrowston

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

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✦ Synopsis

Abstract

All carbon resonances in the title compounds have been unequivocably assigned. Steric effects in the peri substituted compounds have been compared with analogous effects in naphthalene and benzo[b]furan. The observed effects are not explained by current theory. Unusual deshielding steric shifts are observed at some carbons. Methyl substituent effects are not additive at any position in the sterically crowded 2,3‐disubstituted compounds.

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