Photochemical α??Cleavage of β, γ??Unsaturated Aryl Ketones: Competition between recombination/disproportionation and dissociation in geminate singlet and triplet …

HU Gonzenbach, K Schaffner, B Blank…

Index: Gonzenbach, Hans-Ulrich; Schaffner, Kurt; Blank, Bernd; Fischer, Hanns Helvetica Chimica Acta, 1973 , vol. 56, # 5 p. 1741 - 1752

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Citation Number: 17

Abstract

Abstract The photolysis of (R)-(+)-phenyl and (R)-(+)-p-anisyl 1, 2, 3-trimethylcyclopent-2- enyl ketone (1, 2) and the corresponding rac-1-and 3-desmethyl analogs (3, 4) led to isomerization due to formal 1, 3 aroyl migration and to formation of aryl aldehydes (7, 8), dienes (9, 10) and dimers (5, 6) of the cyclopentenyl radical. Evidence obtained from a chiroptical and mass spectrometric analysis of a crossing experiment and from photolytic ...