A catalytic system for ethylene polymerization based on group III and lanthanide complexes of tris(pyrazolyl)borate ligands

Journal of the American Chemical Society

Volumn 118, Issue 49, 1996, Pages 12453-12454

  Long, David P ^a   Bianconi, Patricia A ^a  

^a PENNSYLVANIA STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

METAL COMPLEX; POLYETHYLENE;

ARTICLE; CATALYSIS; COMPLEX FORMATION; POLYMERIZATION; REACTION ANALYSIS;

EID: 0030444260     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja962169b     Document Type: Article

References (34)

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31. The alkyl or hydride complexes (either the pure isolated products or generated in situ) under inert atmosphere were exposed to 120 psi of ethylene in toluene at room temperature for between 2 and 18 h. PE is also produced within minutes by bubbling ethylene at 1 atm through a toluene solution of the yttrium hydride complex.
32. 6 daltons did not fully dissolve, and the molecular weight reported reflects the soluble portion of the sample only.
33. 3].
34. The high catalytic activity of the tert-butyl group in this system is theorized to arise from the inability of more than one such large alkyl to coordinate to the relatively congested yttrium, resulting in a vacant coordination site.