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SENSITIZATION OF THE NORBORNADIENE TO QUADRICYCLENE CONVERSION BY SUBSTITUTED BENZOPHENONES: EVIDENCE AGAINST BIRADICAL INTERMEDIACY
Author(s) -
Gorman A. A.,
Hamblett I.,
McNeeney S. P.
Publication year - 1990
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1990.tb01695.x
Subject(s) - norbornadiene , benzophenone , photochemistry , chemistry , adduct , sensitization , solvent , triplet state , benzene , ketone , acetonitrile , organic chemistry , molecule , catalysis , immunology , biology
— The light‐induced reactions of 4,4'‐dimethoxybenzophenone, benzophenone and 4,4'‐dichlo‐robenzophenone with norbornadiene and quadricyclene have been examined in time‐resolved and steady‐state modes with both acetonitrile and benzene as solvent. It is clearly demonstrated that in all cases formation of quadricyclene as a consequence of bimolccular reaction between ketone triplet and norbornadiene does not proceed via the intermediacy of an adduct biradical as has been recently proposed.