Cyclopropanation of poly[(methylphenylsilanediyl)‐(Z)‐butenylene]. Synthesis and characterization of poly[(methylphenylsilanediyl)methylenecyclopropylenemethylene

Abstract

AbstractPoly[(methylphenylsilanediyl)methylenecyclopropylenemethylene] (3a) was prepared by cyclopropanation of the CC double bonds of poly[(methylphenylsilanediyl)‐(Z)‐butenylene] (2a) by a Simmons‐Smith reaction. Alternatively, 3a was prepared by a Birch reduction of the dichlorocarbene adduct poly[(methylphenylsilanediyl)methylene(2,2‐dichloro‐1,3‐cyclopropanediyl)‐methylene] (4a). Both 3a and 4a show the characteristic absorptions in the 1H, 13C, and 29Si NMR, IR and UV spectra. Their molecular weight distributions, determined by GPC, are rather broad and their thermal stabilities (by TG) are relatively high.