Conclusions
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1.
The complexes ArNiXL2 and HNiXL2 (X is halide, L is tertiary phosphine) in the presence of zinc catalyze the condensation of bromobenzene with styrene (stilbene formation).
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2.
The yield of stilbene and 1,3-diphenylbutene, the dimerization product of styrene, in the presence of pyridine is lowered according to the substitution of phenyl groups on the phosphorus ligand L by alkyl (ethyl, cyclohexyl) groups.
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3.
Change of triphenylphosphine to phenylethylphosphines and tricyclohexylphosphine in the hydride complex HNi(X)(PR3)2, the catalytic activity of which falls in the order X=Cl−≫Br−>I−, favors the dimerization of styrene in the absence of pyridine.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 782–786, April, 1989.
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Kron, T.E., Lopatina, V.S., Morozova, L.N. et al. Catalytic activity of nickel complexes in vinyl hydrogen substitution reactions and styrene dimerization. Russ Chem Bull 38, 703–707 (1989). https://doi.org/10.1007/BF00953273
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DOI: https://doi.org/10.1007/BF00953273