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

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Abstract 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.