Photochemical Reactions. Photochemistry of Homoconjugated Cyclobutanones. I. Synthesis and Photolysis of a Spirodeca-5,7-dien-1-one

Article abstract of DOI:10.1002/hlca.19810640816

The title compound 4 was prepared in 54percent overall yield from eucarvone (5).On triplet sensitization 4 gives two products resulting from a 1,2-acyl shift (8 and 9), whereas singlet excitation of 4 causes decarbonylation and ketene elimination (4->10 a