(Pyrazol-1-ylmethyl)pyridine palladium complexes: Synthesis,molecular structures,and activation of small molecules |
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| Authors: | Stephen O. Ojwach Ilia A. Guzei J. Darkwa |
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| Affiliation: | 1. Department of Chemistry, University of Johannesburg, Auckland Park Kingsway Campus, Auckland Park 2006, South Africa;2. Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA |
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| Abstract: | Reactions of 2-(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L1) and 2-(3,5-di-tert-butylpyrazol-1-ylmethyl)pyridine (L2) with either [PdClMe(COD)] or [PdCl2(COD)] gave the mononuclear palladium complexes [PdCl2(L1)] (1), [PdClMe(L1)] (2) [PdCl2(L2)] (3) and [PdClMe(L2)] (4) in good yields. All compounds were characterized by NMR spectrometry, mass spectrometry, elemental analyses and also by single crystal X-ray crystallography for complexes 1, 3, and 4. The reaction of 2 with NaBAr4 in NCMe gave the salt, [[PdMeNCMe(L3)]BAr4 (5), in good yield. This salt was used as a catalyst to oligomerize ethylene at high pressures to branched polyethylene, but catalytic activity was low. The reaction of 2 with SO2 and CO formed the respective insertion products [PdClS(O)2Me(L1)] (6) and [PdClC(O)Me(L1)] (7). |
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