Synthesis, Structures, and Catalytic Properties of Constrained Geometry Cyclopentadienyl-phenoxytitanium Dichlorides
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- 作者：Yuetao Zhang ; Jianhui Wang ; Ying Mu ; Zhan Shi ; Chunsheng Lü ; Yanrong Zhang ; Lijun Qiao ; and Shouhua Feng
- 刊名：Organometallics
- 出版年：2003
- 出版时间：September 15, 2003
- 年：2003
- 卷：22
- 期：19
- 页码：3877 - 3883
- 全文大小：136K
- 年卷期：v.22,no.19(September 15, 2003)
- ISSN：1520-6041
文摘
The synthesis of four new bidentate ligands, 2-(3,4-diphenylcyclopentadienyl)-6-phenylphenol ((DCPP)H2, 7), 2-(3,4-diphenylcyclopentadienyl)-6-tert-butylphenol ((DCBP)H2, 8), 2-(3,4-diphenylcyclopentadienyl)-4, 6-di-tert-butylphenol (DCDBP)H2, 9), and 2-(3,4-diphenylcyclopentadienyl)-6-methylphenol ((DCMP)H2, 10), as well as their corresponding constrainedgeometry cyclopentadienyl-phenoxytitanium dichlorides ((DCPP)TiCl2 (11), (DCBP)TiCl2 (12),(DCDBP)TiCl2 (13), and (DCMP)TiCl2 (14)), are described. Complexes 11-14 were synthesized from the reaction of TiCl4 with the corresponding dilithio salt of the ligand. Molecularstructures of 11 and 12 were determined by single-crystal X-ray diffraction studies. TheCp(cent)-Ti-O angles of 107.4
for 11 and 106.7 for 12 reveal their sterically open featuresas catalyst precursors. When activated with iBu3Al and Ph3C+B(C6F5)4-, complexes 11-14exhibit reasonable catalytic activity for ethylene polymerization, producing polyethyleneswith moderate molecular weights and melt transition temperatures. Compounds 12 and 13show good catalytic activity for copolymerization of ethylene with 1-hexene.
for 11 and 106.7 for 12 reveal their sterically open featuresas catalyst precursors. When activated with iBu3Al and Ph3C+B(C6F5)4-, complexes 11-14exhibit reasonable catalytic activity for ethylene polymerization, producing polyethyleneswith moderate molecular weights and melt transition temperatures. Compounds 12 and 13show good catalytic activity for copolymerization of ethylene with 1-hexene.