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The Radical Cation of Cyclobutene and its Photoproduct. Preliminary communication
Author(s) -
Gerson Fabian,
Qin XueZhi,
Bally Thomas,
Aebischer JeanNicolas
Publication year - 1988
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19880710519
Subject(s) - cyclobutene , chemistry , radical ion , ring (chemistry) , photochemistry , ionization , coupling constant , medicinal chemistry , ion , organic chemistry , physics , particle physics
Abstract The hitherto unknown radical cation of cyclobutene ( 2 ) has been generated in a CFCl 3 matrix by γ rays at 77 K. The coupling constants, as determined from the ESR spectrum of 2 + , are 2.80 and 1.11 mT for the four CH 2 and the two CH = protons, respectively. Photo‐induced ring opening of 2 + yields a radical cation which exhibits the same ESR and ENDOR spectra as those observed upon direct ionization of s‐ trans ‐buta‐1, 3‐diene (s‐ trans ‐1 ). The radical cation s‐ trans ‐1 + , should, therefore, be the final product of this conversion.