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Electron spin resonance spectrum of the diphenylcyclobutene anion radical

✍ Scribed by Ira B. Goldberg

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
330 KB
Volume
5
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The anion radical of 1,2‐diphenylcyclobutene was studied by electron spin resonance. The hyperfine splittings were found to be 0·47 and 0·74 G for the meta‐positions, 2·23 and 2·69 G for the ortho‐positions and 4·21 G for the para‐positions of the phenyl rings. The methylene proton splittings were 4·27 G, which would imply that the value of Q is 27 G, much lower than that of other cyclobutene anions. It was also estimated that the angle between the axis of the p‐orbitals of the ethylene group and that of the phenyl group is about 30°, in agreement with that found for the tetraphenylethylene anion.

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