Irradiation of a ateroidal enone in the presence of cyclopentene or keten acetal yields the unusuall stable trans- fused [2 + 2]-adducts; the latter adducts can be hydrolsed by acid to yield the long sought trans- frsed cyclobutanone (14).
G. R. Lenz, J. Chem. Soc., Chem. Commun., 1982, 803 DOI: 10.1039/C39820000803
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