Conclusions
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1.
The formation of (η2-methylenecyclopropane)bis(triphenylphosphine)nickel was established in the reaction of methylenecyclopropane (MCP) with Ni(PPh3)3, Ni(PPh3)4, and the catalyst (Cat) obtained by the reduction of NiCl2·6H2O by sodium borohydride in the presence of PPh3.
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2.
31P-{1H} NMR spectroscopy was used to determine that the catalyst was composed of Ni(PPh3)3, Ni(PPh3)4, and, probably, Ni(PPh3)2.
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3.
Interconversions of the catalyst and (η2-methylenecyclopropane)bis(triphenylphosphine)nickel were determined during the transformations of MCP, which supports the scheme for the catalytic cycle of MCP reactions by the action of Ni(O) triphenylphosphine complexes.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 990–994, May, 1989.
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Furman, D.B., Ivanov, A.O., Kudryashev, A.V. et al. Catalytic transformations of C3 cyclic olefins in the presence of Ni(O) complexes. 3. Ni(PPh3)n complexes (n=3,4) as catalysts for the dimerization and trimerization of methylenecyclopropane and reaction intermediates. Russ Chem Bull 38, 892–895 (1989). https://doi.org/10.1007/BF00955412
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DOI: https://doi.org/10.1007/BF00955412