Triple tandem catalyst mixtures for the synthesis of polyethylenes with varying structures

被引:125
作者
Komon, ZJA
Diamond, GM
Leclerc, MK
Murphy, V
Okazaki, M
Bazan, GC [1 ]
机构
[1] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Dept Chem, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Dept Mat, Santa Barbara, CA 93106 USA
[3] Symyx Technol Inc, Santa Clara, CA 95051 USA
关键词
D O I
10.1021/ja0283551
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Tandem catalysis in a single medium presents challenges and opportunities for creating novel synthetic protocols. Thus far, only two homogeneous catalysts have been used in tandem. Herein, we report that it is possible to coordinate the action of three well-defined homogeneous catalysts to produce a wide range of branched polyethylenes from a single monomer. Thus, {[(eta(5)-C5Me4)SiMe2(eta(1)-NCMe3)]-TiMe}{MeB(C6F5)(3)} (1). [(C6H5)(2)PC6H4C(OB(C6H5)(3))O-kappa(2)P,O]Ni(eta(3)-CH2C6H5) (2), and {(H3C)C[N(C6H5)C-[O-B(C6F5)(3)][N(C6H5)]-kappa(2)N,N}Ni(eta(3)-CH2C6H5) (3) react with ethylene to produce branched polyethylene with structures that cannot be obtained using a single- or a two-component Catalyst combination. The properties of the polyethylene depend on the ratio of the three catalysts. High-throughput screening techniques proved essential for optimizing reaction conditions and for probing how the catalyst composition influences the polymer properties.
引用
收藏
页码:15280 / 15285
页数:6
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