The photocycloaddition of a linear steroidal dienone to the electron deficient olefin, methyl acrylate, furnishes the trans-fused cyclobutane adducts, together with the cis-fused adduct; the breakdown in the stereospecificity of this cycloaddition as a function of increasing olefin ionization potential is in agreement with theoretical predictions.
G. R. Lenz and L. Swenton, J. Chem. Soc., Chem. Commun., 1979, 444 DOI: 10.1039/C39790000444
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