Pressure modulates stereoregularities in the polymerization of propylene promoted by rac-octahedral heteroallylic complexes

被引：114
作者：
Volkis, V
Shmulinson, M
Averbuj, C
Lisovskii, A
Edelmann, FT
Eisen, MS [1 ]
机构：
[1] Technion Israel Inst Technol, Dept Chem, IL-32000 Haifa, Israel
[2] Univ Magdeburg, Chem Inst Otto Von Guericke, D-39106 Magdeburg, Germany
来源：
ORGANOMETALLICS | 1998年 / 17卷 / 15期
关键词：
D O I：
10.1021/om980335d
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
This communication reports the synthesis and activity of four racemic mixtures of bis(benzamidinate) group-4 complexes, cis-[p-R'C6H4C(NR)(2)](2)MX2 (R' = CH3, R = SiMe3, M = Ti, X = Cl (I); R' = CH3, R = SiMe3, M = Zr, X = Cl (2); R' = H, R = i-pr, M = Zr, X = Cl (3); R' = CH3, R = SiMe3, M = Zr, X = CH3 (4)) as precatalysts for the stereoregular polymerization of propylene. These complexes catalyze the stereoregular polymerization. of propylene only under pressure in CH2Cl2, producing polypropylene with very Large isotacticities (mmmm % = similar to 95-98), high melting points (140-154 degrees C).
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页码：3155 / 3157
页数：3
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