A highly active anilinotropone-based neutral nickel(II) catalyst for ethylene polymerization

Organometallics

Volumn 20, Issue 15, 2001, Pages 3217-3219

  Hicks, Frederick A ^a   Brookhart, Maurice ^a  

^a University of North Carolina at Chapel Hill   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ANILINOTROPONE; ELECTROPHILICITY; NEUTRAL NICKEL CATALYST; TURNOVER FREQUENCY;

ADDITIVES; CATALYSTS; CHELATION; COMPLEXATION; DISSOCIATION; NEGATIVE IONS; OLEFINS; POLYETHYLENES; POLYMERIZATION; PRESSURE; TEMPERATURE; X RAY CRYSTALLOGRAPHY;

NICKEL COMPOUNDS;

EID: 0035939691     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om010211s     Document Type: Article

References (23)

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16. w = 0.086 for 4550 reflections.
17. The optimized conditions involve 5.3 μmol of catalyst in 200 mL of toluene under 200 psig of ethylene at 80 °C.
18. The possibility of mass transfer limited TOF's was raised by one reviewer. Experiments run under identical conditions with 3.0 and 7.6 μmol of 3 produced essentially identical TOF's, indicating mass transfer is not an issue with this system.
19. 1H NMR end group analysis.
20. The optimized conditions for 2 involve reaction temperatures between 45 and 50 °C and 100 psig of ethylene.
21. All polymerizations were run with low catalyst loadings to prevent the occurrence of rapid and vigorous exotherms.
22. Initial experiments employing exceptionally high purity ethylene give increased TON's at 400 psig and above, suggesting that impurities in the ethylene may be contributing to the decrease in activity at higher pressures. The identity of possible interfering impurities is not clear.
23. 3 a 100-fold decrease, and EtOH a 50-fold decrease.