The Photochemistry of 2??Cyclopentenyl Methyl Ketones

HU Gonzenbach, IM Tegmo??Larsson…

Index: Gonzenbach,H.-U. et al. Helvetica Chimica Acta, 1977 , vol. 60, p. 1091 - 1123

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Citation Number: 21

Abstract

Abstract 2-Cyclopentenyl and 3-phenyl-2-cyclopentenyl methyl ketones (15–18, 30, 31) undergo a 1, 3-acetyl shift on direct irradiation, and the oxa-di-π-methane rearrangement to photochemically non-interconverting endo and exo bicyclo-[2.1. 0] pentyl methyl ketones on triplet sensitization. Exceptions include the 2-methyl-3-phenyl-2-cyclopentenyl methyl ketone 32 and the 1-phenyl-2-cyclo-pentenyl methyl ketone 44 which are unreactive on ...