The photocycloaddition of a steroidal 4-ene-3,6-dione to olefins and dienes yields a regio- and stereospecific [4 + 2]-dihydropyran adduct as well as smaller amounts of a [2 + 2]-cyclobutane adduct.
G. R. Lenz, J. Chem. Soc., Chem. Commun., 1977, 700 DOI: 10.1039/C39770000700
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