On photolysis in methanol the stereoisomeric 7-chloro-7-methylbicyclo[3.2.0]hept-2-en-6-ones and their saturated analogues give the cyclopropylesters (4) and (6); the importance of ring contraction–solvolysis depends on the conformational preferences of the exo- and endo-stereoisomers.
G. Jones and L. P. McDonnell, J. Chem. Soc., Chem. Commun., 1976, 18 DOI: 10.1039/C39760000018
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