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A typical polymerization was done as follows: A solution of 50 mg (33.9 μmol) of the Pd-α-dimine catalyst in 100 ml of chlorobenzene was transferred into a 600-ml Parr pressure reactor under nitrogen. The reactor was heated to 35°C, and the solution was stirred by a mechanical stirrer set at 500 rpm. The reactor was pressurized with ethylene to 101.3 kPa. Polymerization was continued at 35°C and 101.3 kPa for 18.7 hours. After termination of the polymerization, the solution was diluted with toluene, then passed through a column packed with alumina, silica gel, and Celite to remove the catalyst, and finally precipitated into a large excess of methanol. The polymer was collected and dried in vacuo to give 15.8 g of PE as viscous oil.
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0344575232
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note
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We thank M. S. Brookhart, L. K. Johnson, M. Spinu, S. D. Ittel, L. Wang, Z. Yang, P. Soper, and S. D. Arthur for helpful discussions; R. E. Fuller for viscosity measurements; and J. Chen, J. Galperin, P. A. Ware, C. A. Urbston, and M. J. Halfhill for technical assistance.
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