Chemistry Letters, Vol.30, No.3, 248-249, 2001
Preparation of sterically protected 3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]-1,2-bis[4-(4-vinylphenyl )butyl]cyclobutene and its polymers
Two new sterically protected 3,4-diphosphinidenecyclobutenes, i.e., 1.2-bis [4-(4-methylphenyl)butyl]-3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene ]cyclobutene, and 3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]-1,2-bis[4-(4-vinylphenyl )butyl]cyclobutene, were prepared. Copolymerization of the latter with styrene was studied. Treatment of [6-(4-vinylphenyl)hex-1- ynyl] (2,4,6-tri-t-butylphenyl)phosphine with butyllithium and 1,2-dibromoethane afforded a polymer of the latter cyclobutene.