Spectral studies of a Cr(PNP)-MAO system for selective ethylene trimerization catalysis: searching for the active species.

Spectral studies of a Cr(PNP)-MAO system for selective ethylene trimerization catalysis: searching for the active species.
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用于选择性乙烯三聚催化的 Cr(PNP)-MAO 系统的光谱研究:寻找活性物种。

DOI:
10.1021/cs400778a
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发表时间:
2013-11-01
期刊:
影响因子:
12.9
通讯作者:
Bercaw, John E.
Bercaw, John E.
中科院分区:
化学1区
文献类型:
--
作者:
Do, Loi H.;Labinger, Jay A.;Bercaw, John E.

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对可溶性CrIIICl3(PNP)(PNP =双(二芳基膦基)烷基胺)乙烯三聚预催化剂进行了变温光谱、动力学和化学研究,以绘制出其甲基铝氧烷(MAO)活化序列。这些研究表明,治疗CrIIICl3(PNP)与MAO导致第一次更换的氯化物与烷基,其次是烷基抽象,然后减少到较低价的物种。反应性研究表明,大多数检测到的铬物种没有催化活性。
Variable temperature spectroscopic, kinetic, and chemical studies were performed on a soluble CrIIICl3(PNP) (PNP = bis(diarylphosphino)alkylamine) ethylene trimerization precatalyst to map out its methylaluminoxane (MAO) activation sequence. These studies indicate that treatment of CrIIICl3(PNP) with MAO leads to first replacement of chlorides with alkyl groups, followed by alkyl abstraction, and then reduction to lower–valent species. Reactivity studies demonstrate that the majority of the chromium species detected is not catalytically active.
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