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Olefin Polymerization Catalyzed by Titanium−Tungsten Heterobimetallic Dinitrogen Complexes1

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posted on 27.09.2004, 00:00 by Hiroshige Ishino, Shin Takemoto, Kenji Hirata, Yuka Kanaizuka, Masanobu Hidai, Masaaki Nabika, Yoshinori Seki, Tatsuya Miyatake, Noriyuki Suzuki
A new family of highly active olefin polymerization catalysts based on titanium−tungsten heterobimetallic dinitrogen complexes, [Cp‘TiCl2(μ-N2)WCl(L)4] (1; L = PMe2Ph, 1/2 R2PCH2CH2PR2; R = Et, Ph), has been developed, in which the tungsten dinitrogen fragment acts as a novel metallonitrogen ligand to the catalytically active titanium center. Alkylation of 1d (Cp‘ = C5Me5, L = 1/2 Et2PCH2CH2PEt2) with MeLi gave di- and trimethyl derivatives 2d and 3d, which were structurally characterized.

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