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100 MHz n.m.r. spectra and conformational analysis of some methyl and trimethyl derivatives of 1-tetralone

✍ Scribed by Knut Bergesen; Michael J. Cook; Teh Kim Hock

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

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✦ Synopsis

Abstract

The 100 MHz spectra of 2‐methyl‐, 4‐methyl‐, 4,5,8‐trimethyl‐ and 4,5,7‐trimethyl‐1‐tetralones have been analysed as 8‐spin systems using iterative computation. The monomethyl derivatives exist in inverting half‐chair conformations, the 2‐methyl group favouring the equatorial site and the 4‐methyl group showing equal preference for both axial and equatorial environments. The 5‐methyl substituent of the trimethyl derivatives constrains the 4‐methyl group to the axial site of rings which adopt non‐half‐chair conformations. The n.m.r. spectrum of 3‐methyl‐1‐tetralone is also discussed.

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