A Highly Active Anilinotropone-Based Neutral Nickel(II) Catalyst for Ethylene Polymerization
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- 作者：Frederick A. Hicks and Maurice Brookhart
- 刊名：Organometallics
- 出版年：2001
- 出版时间：July 23, 2001
- 年：2001
- 卷：20
- 期：15
- 页码：3217 - 3219
- 全文大小：42K
- 年卷期：v.20,no.15(July 23, 2001)
- ISSN：1520-6041
文摘
The synthesis of a neutral nickel(II) complexof 2-(2,6-diisopropylanilino)tropone is described. Theimportant attributes of this ligand include a hinderedN-aryl ring, a five-membered-ring chelate, and ananionic N-donor. The complex has been characterizedin the solid state by X-ray crystallography, and relevantfeatures are discussed. The nickel complex is capable ofpolymerizing ethylene with a turnover frequency of upto 8.8 × 106 g of PE (mol of catalyst)-1 h-1 and ofproducing polyethylenes with a wide range of branchingnumbers by changes in pressure and temperature. Thecatalyst shows an excellent tolerance for polar additivesin ethylene polymerization experiments and is quiteinsensitive to added PPh3.1