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- W2034256147 abstract "Fully substituted trichloro(η 5 -cyclopentadienyl)titanium(IV) complexes with pendant alkenyl groups, [TiCl 3 (η 5 -C 5 Me 4 R)] (R = CH(Me)CH=CH 2 ( 3a ), (CH 2 ) 2 CH=CH 2 ( 3b ), and (CH 2 ) 3 CH=CH 2 ( 3c )), were synthesized by the reaction of the corresponding trimethylsilyl or trimethylstannyl substituted cyclopentadienes C 5 Me 4 R(EMe 3 ), where E = Si or Sn, with TiCl 4 . In all cases, the pendant double bonds did not exhibit any interaction with the titanium atoms as indicated by 1 H, 13 C NMR or IR spectra as well as by the solid-state structure of 3c . The catalytic systems prepared by mixing complexes 3a - 3c , [TiCl 3 (η 5 -C 5 Me 5 )], [TiCl 3 (η 5 -C 5 H 5 )], and similar complexes with R = butyl ( 4 ), phenyl ( 5 ), 4-fluorophenyl ( 6 ) with methylalumoxane (MAO) at the molar ratio Al/Ti = 500 catalyzed polymerization of styrene to syndiotactic polystyrene. Their polymerization activities increase in the order: [TiCl 3 (η 5 -C 5 Me 5 )] < 3a < 3b < 3c < 4 < 5 < 6 < [TiCl 3 (η 5 -C 5 H 5 )], while the molecular weights ( M w ) of syndiotactic polystyrene grow in the order: [TiCl 3 (η 5 -C 5 H 5 )] < 3a < 3b < 4 ≈ 6 < [TiCl 3 (η 5 -C 5 Me 5 )] < 3c ≈ 5 (maximum M w ca 3.0 · 10 5 ). A comparison of the results for the catalytic systems based on 4 with those derived from 3a - 3c points to a rather weak competition of the pendant double bonds with monomer for a cationic Ti(III) catalytic centre." @default.
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- W2034256147 date "2001-01-01" @default.
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- W2034256147 title "Synthesis of Trichloro(η5-alkenyltetramethylcyclopentadienyl)titanium(IV) Complexes and Their Activity in Styrene Polymerization" @default.
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- W2034256147 doi "https://doi.org/10.1135/cccc20011359" @default.
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