Abstract
Irradiation of 3,5-dibromo-2,6-dimethylhepta-2,5-dien-4-one in hexane under nitrogen at ca. 300 nm yields, as the major product, 2-bromo-5-isopropylidene-3-methylcyclopent-2-enone. The minor product is a symmetrical photodimer, (C9H10O)2, of tricyclo[5.3.0.02,6]decane type, produced by a [π2s+π2s] process; it is susceptible to autoxidation in air.
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