Photochemical generation of vinylketenes by electrocyclic opening of cyclobutenones
作者:Alfred Hassner、Simha Naidorf
DOI:10.1016/s0040-4039(00)87816-8
日期:1986.1
4-Dich1oro-2-cyclobutenones , available by cycloaddition of acetylenes to dichloroketene, can be photolyzed in the presence of olefins or dienes to produce regiospecifically 2-vinylcyclobutanones . The photochemical reaction succeeds even in some cases where thermolysis fails and was shown to proceed by electrocyclic ring opening to a vinylketene. Stereochemically the results of photolysis of differ from thermolysis