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- W2069851189 abstract "The complex Ti(η-C4H6)2(dmpe)(dmpe = 1,2-bis(dimethylphosphino)ethane) was prepared by Na/Hg reduction of TiCl4(dmpe) in the presence of butadiene. The compound is a poorer Lewis base than is Zr(η-C4H6)2(dmpe), as it fails to form seven-coordinate adducts analogously to the Zr complex. Both complexes catalyze the dimerization of ethylene to 1-butene and, by cross dimerization with additional ethylene, 3-methyl-1-pentene and 2-ethyl-1-butene. Propene is converted to 2,3-dimethyl-1-butene, cis-2-Butene is very slowly dimerized to 3,4-dimethyl-1-hexene. On the basis of the products formed and their distribution, a mechanism involving formation of a metallocyclopentane complex is proposed. The reaction is first-order in olefin and is slowed by increasing substitution. Formation of a mono(olefin) complex is the probable rate-determining step." @default.
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- W2069851189 date "1980-04-01" @default.
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- W2069851189 title "Bisbutadiene[1,2-bis(dimethylphosphino)ethane]titanium(0) olefin dimerizations catalyzed by titanium and zirconium butadiene complexes" @default.
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- W2069851189 doi "https://doi.org/10.1016/s0022-328x(00)83048-x" @default.
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