Synthesis and polymerization behavior of novelC1 andCs titaniumansa-cyclopentadienyl-amido catalysts for ethylene and propylene polymerization

Autor:	James C. W. Chien, Marvin D. Rausch, J. S. Wood, Barrie Rhodes, A. Chandrasekaran
Rok vydání:	2002
Předmět:	Ethylene Methylaluminoxane Substituent chemistry.chemical_element General Chemistry Crystal structure Catalysis Inorganic Chemistry chemistry.chemical_compound chemistry Cyclopentadienyl complex Polymerization Polymer chemistry Organic chemistry Titanium
Zdroj:	Applied Organometallic Chemistry. 16:323-330
ISSN:	1099-0739 0268-2605
DOI:	10.1002/aoc.304
Popis:	Four titanium ansa-cyclopentadienyl-amido complexes of the general formula [C5H3RMe2SiN(2,6-Me2C6H3)]TiX2(R = H,Me,Bz,tBu;X = NMe2 or Cl) have been synthesized. The complexes polymerize both ethylene and propylene in the presence of methylaluminoxane or Ph3CB(C6F5)4–triisobutylaluminum and were most active at lower temperatures. In general, the smaller the substituent on the cyclopentadienyl group, the more active the catalyst. The catalysts were found to be poorly stereoselective for the polymerization of polypropylene, with the tertiary-butyl substituted catalyst giving a polymer with the greatest [mmmm] (14.2%). The structure of [C5H4Me2SiN(2,6-Me2C6H3)] Ti(NMe2)2 was determined by X-ray diffraction. The complex crystallizes in the monoclinic system space group P21/n, with a = 16.437(2), b = 8.652(3), c = 16.494(4),β = 117.54(2) and Z = 4. Copyright © 2002 John Wiley & Sons, Ltd.
Databáze:	OpenAIRE
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