[((ETA-5-C5ME4)ME2SI(ETA-1-NCME3))(PME3)SCH]2 - A UNIQUE EXAMPLE OF A SINGLE-COMPONENT ALPHA-OLEFIN POLYMERIZATION CATALYST

被引：549

作者：

SHAPIRO, PJ ^{[1
]}

BUNEL, E ^{[1
]}

SCHAEFER, WP ^{[1
]}

BERCAW, JE ^{[1
]}

机构：

[1] CALTECH,DEPT CHEM,PASADENA,CA 91125

来源：

ORGANOMETALLICS | 1990年 / 9卷 / 03期

关键词：

D O I：

10.1021/om00117a055

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The synthesis and structure of the title compound are described. [{(η5-C5Me4)Me2Si(η1-NCMe3)}Sc-(PMe3)]2(μ-H)2 (3) crystallizes with a molecule of toluene per scandium in the monoclinic system, space group C2/c, with a = 21.238 (3) Å, b = 11.470 (2) Å, c = 22.253 (3) Å, β = 113.16(1)°, V = 4984.0 (14) Å3, Z = 8 (four dimers), and d = 1.24 g·cm-3. Propene, 1-butene, and 1-pentene are cleanly, albeit slowly, polymerized with >99% “head-to-tail” coupling to produce linear, atactic polymers with Mn = 3000-4000 and PDI's of 1.7-2.1. Chain transfer is relatively slow and appears to occur by β-H elimination. All evidence points to a one-component catalyst system with all scandium centers functioning alike. © 1990, American Chemical Society. All rights reserved.

引用

页码：867 / 869

页数：3