Synthesis and evaluation of substituted pyrazoles palladium(II) complexes as ethylene polymerization catalysts

Kelin Li; James Darkwa; Ilia A. Guzei; Selwyn F. Mapolie

doi:10.1016/S0022-328X(02)01799-0

Synthesis and evaluation of substituted pyrazoles palladium(II) complexes as ethylene polymerization catalysts

Kelin Li, James Darkwa, Ilia A. Guzei, Selwyn F. Mapolie

Research output: Contribution to journal › Article › peer-review

72 Citations (Scopus)

Abstract

The substituted pyrazole palladium complexes, (3,5-^tBu₂pz)₂PdCl₂ (1) (3,5-Me₂pz)₂PdCl₂ (2), (3-Mepz)₂PdCl₂ (3) and (pz)₂PdCl₂ (4) (pzH=pyrazole), can be prepared from the reaction of (COD)PdCl₂ with the appropriate pyrazole. The chloromethyl derivative, (3,5-^tBu₂pz)₂PdCl(Me) (5), was prepared from (COD)PdClMe and ^tBu₂pzH. X-ray crystal structure determination of 1 and 5 established their structures in the solid state to be the trans-isomer. After activation of 1-4 and 5 with methylaluminoxane (MAO) the resulting palladium complexes were used as catalysts in ethylene polymerization, yielding linear high-density polyethylene (HDPE). The highest activity was observed for (3,5-^tBu₂pz)PdClMe.

Original language	English
Pages (from-to)	108-115
Number of pages	8
Journal	Journal of Organometallic Chemistry
Volume	660
Issue number	1
DOIs	https://doi.org/10.1016/S0022-328X(02)01799-0
Publication status	Published - 7 Oct 2002
Externally published	Yes

Keywords

High density polyethylene (HDPE)
Palladium(II)
Pyrazole

ASJC Scopus subject areas

Biochemistry
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/S0022-328X(02)01799-0

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title = "Synthesis and evaluation of substituted pyrazoles palladium(II) complexes as ethylene polymerization catalysts",

abstract = "The substituted pyrazole palladium complexes, (3,5-tBu2pz)2PdCl2 (1) (3,5-Me2pz)2PdCl2 (2), (3-Mepz)2PdCl2 (3) and (pz)2PdCl2 (4) (pzH=pyrazole), can be prepared from the reaction of (COD)PdCl2 with the appropriate pyrazole. The chloromethyl derivative, (3,5-tBu2pz)2PdCl(Me) (5), was prepared from (COD)PdClMe and tBu2pzH. X-ray crystal structure determination of 1 and 5 established their structures in the solid state to be the trans-isomer. After activation of 1-4 and 5 with methylaluminoxane (MAO) the resulting palladium complexes were used as catalysts in ethylene polymerization, yielding linear high-density polyethylene (HDPE). The highest activity was observed for (3,5-tBu2pz)PdClMe.",

keywords = "High density polyethylene (HDPE), Palladium(II), Pyrazole",

author = "Kelin Li and James Darkwa and Guzei, {Ilia A.} and Mapolie, {Selwyn F.}",

year = "2002",

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doi = "10.1016/S0022-328X(02)01799-0",

language = "English",

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pages = "108--115",

journal = "Journal of Organometallic Chemistry",

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T1 - Synthesis and evaluation of substituted pyrazoles palladium(II) complexes as ethylene polymerization catalysts

AU - Li, Kelin

AU - Darkwa, James

AU - Guzei, Ilia A.

AU - Mapolie, Selwyn F.

PY - 2002/10/7

Y1 - 2002/10/7

N2 - The substituted pyrazole palladium complexes, (3,5-tBu2pz)2PdCl2 (1) (3,5-Me2pz)2PdCl2 (2), (3-Mepz)2PdCl2 (3) and (pz)2PdCl2 (4) (pzH=pyrazole), can be prepared from the reaction of (COD)PdCl2 with the appropriate pyrazole. The chloromethyl derivative, (3,5-tBu2pz)2PdCl(Me) (5), was prepared from (COD)PdClMe and tBu2pzH. X-ray crystal structure determination of 1 and 5 established their structures in the solid state to be the trans-isomer. After activation of 1-4 and 5 with methylaluminoxane (MAO) the resulting palladium complexes were used as catalysts in ethylene polymerization, yielding linear high-density polyethylene (HDPE). The highest activity was observed for (3,5-tBu2pz)PdClMe.

AB - The substituted pyrazole palladium complexes, (3,5-tBu2pz)2PdCl2 (1) (3,5-Me2pz)2PdCl2 (2), (3-Mepz)2PdCl2 (3) and (pz)2PdCl2 (4) (pzH=pyrazole), can be prepared from the reaction of (COD)PdCl2 with the appropriate pyrazole. The chloromethyl derivative, (3,5-tBu2pz)2PdCl(Me) (5), was prepared from (COD)PdClMe and tBu2pzH. X-ray crystal structure determination of 1 and 5 established their structures in the solid state to be the trans-isomer. After activation of 1-4 and 5 with methylaluminoxane (MAO) the resulting palladium complexes were used as catalysts in ethylene polymerization, yielding linear high-density polyethylene (HDPE). The highest activity was observed for (3,5-tBu2pz)PdClMe.

KW - High density polyethylene (HDPE)

KW - Palladium(II)

KW - Pyrazole

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U2 - 10.1016/S0022-328X(02)01799-0

DO - 10.1016/S0022-328X(02)01799-0

M3 - Article

AN - SCOPUS:0037037382

SN - 0022-328X

VL - 660

SP - 108

EP - 115

JO - Journal of Organometallic Chemistry

JF - Journal of Organometallic Chemistry

IS - 1

ER -

Synthesis and evaluation of substituted pyrazoles palladium(II) complexes as ethylene polymerization catalysts

Abstract

Keywords

ASJC Scopus subject areas

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