The Structure of Homopolymers of Vinyl-gem-diehlorocy clopropanes

摘要

The cleavage of the gem-dichlorocyclopropane ring takes place at temperatures above 150°C[1,2].Transformations and substitution of halogen in alkyl-,alkenyl-,and aryl-gem-dichlorocyclopropanes are known to occur at 20-100°C with retention of the carbocycle[3-5].We have found that vinyl-gem-dichlorocyclopro-panes I and II under conditions of bulk radical polymerization at 60-80°C(DAC and/or BP as initiators)or at ambient temperature(UV irradiation,benzophenone as a sensitizer)form in 40-45% yield homopolymers containing no carbocyclic fragments.