Synthesis of A Novel Zirconocene Complex (1,2-Ph2-4-PrCp)2ZrCl2 and Catalysis for Olefin Polymerization

Abstract

Abstract: A new cyclopentadiene derivative 1,2-diphenyl-4-propyl-1,3-cyclopentadiene(1) was synthesized by reaction of 3,4-diphenyl-2-cyclopentenone with n propyl lithium. 1 was treated with n butyl lithium and then reacted with ZrCl₄ in toluene to give sterically bulky unbridged zirconocene dichloride(1,2-Ph₂-4-PrCp)₂ZrCl₂(2). ¹H NMR and ¹³ C NMR spectroscopic analyses reveal its C_2v-symmetric conformation in solution. Upon activation with methylaluminoxane(MAO), 2 effectively polymerizes ethylene and produces high molecular weight polyethylenes with high melting transition temperatures at low Al/Zr ratios. At ambient conditions, 2/MAO system shows high catalytic activity in propylene polymerization and produces oily oligomers.

Key words: Metallocene catalyst, Zirconocene, Olefin polymerization, Homogeneous catalysis

CLC Number:

O631

TrendMD:

ZHANG Fan, MU Ying, CHEN Cong-Xi  . Synthesis of A Novel Zirconocene Complex (1,2-Ph₂-4-PrCp)₂ZrCl₂ and Catalysis for Olefin Polymerization[J]. Chem. J. Chinese Universities, 2002, 23(1): 143.

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Synthesis of A Novel Zirconocene Complex (1,2-Ph₂-4-PrCp)₂ZrCl₂ and Catalysis for Olefin Polymerization

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