Photochemical ring contraction–solvolysis in the 7-chloro-7-methyl-bicyclo[3.2.0]heptan-6-one series. A linked dependence on configuration and conformation
Abstract
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.