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6632843 
Journal Article 
Formation of carbocationic sigma-alkyl Ni(I) complexes in the catalytic system Ni(PPh3)(4)+BF3 center dot OEt2 center dot ionic coordination transformations of unsaturated hydrocarbons 
Saraev, VV; Kraikivskii, PB; Zelinskii, SN; Ratovskii, GV; Tkach, VS; Shmidt, FK; , 
2001 
1 
Russian Journal of Coordination Chemistry
ISSN: 1070-3284
EISSN: 1608-3318 
MAIK NAUKA/INTERPERIODICA 
NEW YORK 
757-761 
WOS:000172169900001 
The reactions of the individual cationic complex [(PPh3)(3)Ni]BF4 with unsaturated hydrocarbons (ethene, propene, and styrene), as well as the reaction of the sigma -alkyl Ni(I) complex (PPh3)(2)Ni-CH(COOC2H5)(2) (obtained in situ) with ethene, were studied using EPR, UV, and NMR spectroscopy. It was found that stable dimeric carbocationic sigma -alkyl Ni(I) complexes are intermediates in the reactions of unsaturated hydrocarbons with cationic Ni(I) complexes. The transformations of unsaturated hydrocarbons on cationic Ni(I) complexes were explained in terms of an experimentally justified ionic coordination mechanism. A stable mononuclear Ni(I) complex with a Ni-C sigma -bond was synthesized and characterized using EPR. An organonickel(I) complex with pi- and sigma -bonded carbon atoms was identified using EPR and NMR methods.