Photochemical conversion of 7,7-diphenyl-2,3-epoxybicyclo[3.2.0]heptan-6-ones into a 2-oxabicyclo[2.1.1]hexan-3-one
Abstract
Photolysis of the epoxide (3) or (5)gave the strained lactone (4) in 40–50% yield; the bicyclic lactone (4)gave the functionalised cyclobutane (6) on treatment with acidic methanol, the structure of which was confirmed by X-ray analysis.