Synthesis and evaluation of substituted pyrazoles palladium(II) complexes as ethylene polymerization catalysts |
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Authors: | Kelin LiJames Darkwa Ilia A GuzeiSelwyn F Mapolie |
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Affiliation: | a Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa b Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA |
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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. |
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Keywords: | High density polyethylene (HDPE) Palladium(II) Pyrazole |
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