NMR studies of sulphur heterocycles: III— 13 C spectra of benzo[ b ]thiophene and the methylbenzo[ b ]thiophenes
1976; Wiley; Volume: 8; Issue: 5 Linguagem: Inglês
10.1002/mrc.1270080507
ISSN0030-4921
AutoresP. D. Clark, D. F. Ewing, R. M. Scrowston,
Tópico(s)Structural and Chemical Analysis of Organic and Inorganic Compounds
ResumoAbstract 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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