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Spectroscopic studies of 1,2-diphenyl-3,3,4,4-tetramethylcyclobutene and 3,4-diphenyl-2,5-dimethyl-2,4-hexadiene radical cations and their possible interconversion

✍ Scribed by Beth-Ellen Brauer; Marion C. Thurnauer

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 668 KB
Volume: 133
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(87)87053-7

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✦ Synopsis

In order to study radical cation rearrangements, the species generated by y-irradiation of 1,2-diphenyl-3,3,4,4-tetramethylcyclobutene (CB) and 3,4-diphenyl-2,5-dimethyl-2,4-hexadiene (BD) in frozen Freon solutions were studied by monitoring their EPR and visible absorption spectra. The optical and EPR spectra are indicative of CB+ and BD+. Conversion of CB+ to BD' is not a dominant process at low temperatures in CFC13 or the Freon mixture (50:50 CFC19:CF,BrCF2Br) but can be assisted photochemically.

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