title: From unstable to stable: half-metallocene catalysts for olefin polymerization.
abstract: The reaction of LAlMeOH [L = CH(N(Ar)(CMe))2, Ar = 2,6-i-Pr2C6H3] with CpTiMe3, Cp*TiMe3, and Cp*ZrMe3 was investigated to yield LAlMe(mu-O)TiMe2Cp (2), LAlMe(mu-O)TiMe2Cp* (3), and LAlMe(mu-O)ZrMe2Cp* (4), respectively. The resulting compounds 2-4 are stable at elevated temperatures, in contrast to their precursors such as CpTiMe3 and Cp*ZrMe3, which already decompose below room temperature. Compounds 2-4 were characterized by single-crystal X-ray structural analysis. Compounds 2 and 3 were tested for ethylene polymerization in the presence of methylaluminoxane. The half-metallocene complex 3 has higher activity compared to 2. The polydispersities are in the range from 2.8 to 4.2. A copolymerization with styrene was not observed.
authors.affiliation: Institute of Inorganic Chemistry, University of Göttingen, Göttingen, Germany.
authors.forename: Prabhuodeyara M
authors.initials: PM
authors.lastname: Gurubasavaraj
authors.forename: Herbert W
authors.initials: HW
authors.lastname: Roesky
authors.forename: Bijan
authors.initials: B
authors.lastname: Nekoueishahraki
authors.forename: Aritra
authors.initials: A
authors.lastname: Pal
authors.forename: Regine
authors.initials: R
authors.lastname: Herbst-Irmer