Syndiospezifische polymerisation von propylen: Neue metallocenkomplexes des typs (C13H8−nRnCR′R″C5H4)MCl2n = 0,2; R = Alkyl, Aryl, Hal; R′, R″ = H, Alkyl, Aryl; M = Zr, Hf) unter besonderer berücksichtigung verschiedener brückensubstituenten
摘要:
Eight new catalyst precursors with C-s-symmetry and of the general formula (C(13)H(8-n)R(n)CR'R '' C5H4)MCl(2) (n = 0, 2; R = Alkyl, Aryl, Hal; R', R '' = H, Alkyl, Aryl; M = Zr, Hf) have been synthesized and characterized by NMR spectroscopy, Complexes 1b-7b and 3c can be activated by MAO and are useful catalysts for the syndiospecific polymerization of propylene. First analytic results of the various polypropylene samples are discussed.
C1-Bridged fluorenylidene cyclopentadienylidene complexes of the type (C13H8–CR1R2–C5H3R)ZrCl2 (R1, R2=alkyl, phenyl, alkenyl; R=H, alkyl, alkenyl, substituted silyl) as catalyst precursors for the polymerization of ethylene and propylene
作者:Helmut G. Alt、Michael Jung
DOI:10.1016/s0022-328x(98)00740-2
日期:1998.10
The synthesis and characterization of 14 new C1-bridged fluorenylidene cyclopentadienylidene complexes of zirconium is described. After activation with methylaluminoxane (MAO), these metallocene complexes can be used for the polymerization of ethylene and propylene. Various substituents in the bridge and in position 3 of the cyclopentadienylidene ligand have a strong influence on the activity of the