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- W2146384580 abstract "We have studied the reaction of ethylene with a group of [NiXRL2] complexes with R = 2,4,6-Me3C6H2, 3,5-Cl2C6H3, 2,3-Cl2C6H3, C6Cl5, or 2-MeC6H4 and L = mainly PPh3. Migratory insertion and β-elimination of vinyl or butenyl R products was observed, but only under ethylene pressure. The smallest activation energy for this reaction was observed with the complex containing 2,4,6-Me3C6H2. Detection of the hydride generated in these reactions has been attempted by formation of a metalacycle using [NiBr(2,4,6-Me3C6H2)(PPh2(CH2CH2CHCH2))2] as the starting complex. The direction of the insertion of propene into the NiR bond depends on the size of R. When R = mesityl, 100% of Ni → C2 compounds were obtained, whereas for R = 3,5-Cl2C6H3, 80% of Ni → C1 compounds were recovered. Many of the hydride species formed in the reactions of neutral and ionic mesityl derivatives [NiBr(2,4,6-Me3C6H2)L2] and [Ni(2,4,6-Me3C6H2)(CH3CN)L2]BF4 (L PEt3, PMe2Ph, PPh3, P(nBu)3, P(iBu)3, PCy3, PBz3, dppe or PN(PPh2CH2(2-py)) with ethylene are able to catalyze the dimerization of ethylene. Bidentate ligands do not show any activity. The insertion of ethylene in the nickel—carbon bonds occurs after prior dissociation of a neutral ligand. The different selectivities are discussed." @default.
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- W2146384580 date "1992-05-01" @default.
- W2146384580 modified "2023-10-16" @default.
- W2146384580 title "Reactions of neutral and ionic square-planar organometallic nickel compounds with ethylene" @default.
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- W2146384580 doi "https://doi.org/10.1016/0022-328x(92)83187-m" @default.
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