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Nuclear magnetic resonance III-13C NMR spectral studies on substituted indoles

✍ Scribed by K. M. Biswas; R. N. Dhara; H. Mallik; S. Roy

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
208 KB
Volume
23
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

^13^C signal assignments of 3‐ethyl‐1‐methylindole (1), 1‐methyl‐3‐phenylindole (3), 1,3‐dimethyl‐2‐phenylindole (5), 1‐methyl‐2,3‐diphenylindole (10), 1,5‐dimethyl‐2,3‐diphenylindole (12), 7‐methoxy‐2,3‐diphenylindole (13), 7‐methoxy‐4‐methyl‐2,3‐diphenylindole (14) and 1‐(7‐methoxy‐4‐methyl‐2,3‐diphenyl‐6‐indolyl)‐1‐(7‐methoxy‐2,3‐diphenyl‐4‐indolyl)methane (15) are reported. Contrary to an earlier report on monophenylindoles, the para carbons of the phenyl groups of 3, 5, 10 and 12–15 resonate at lower frequencies than their ortho carbons. The methoxy carbon at position 7 in 15 absorbs at a higher frequency than other similar carbons in 13–15 owing to steric inhibition to resonance.

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