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Substituent effects in cycloheptatrienyl radicals: An ESR spectroscopic study

✍ Scribed by Reiner Sustmann; Dieter Brandes; Fritz Lange; Hasan I. Tashtoush

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
297 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

ESR spectral parameters of methoxy-, hydroxy-and cyano-substituted cycloheptatrienyl radicals are reported. The radicals were obtained in adamantane matrices by the rearrangement of substituted bicyclo(3.2.0lheptadienyl radicals. The hypefine splitting parameters are interpreted in terms of the effect of donor and acceptor substituents on the degeneracy of the relevant singly occupied Ys or YA ABMO of the cyclobeptatrienyl radical. In addition, an attempt was made to study the deuterium isotope effect on the degenerate MOs at low temperatures in a ['H,,]adamantane matrix.

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