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6594638 
Journal Article 
EPR study of oxidation reaction of nickel(0) phosphine complexes with boron trifluoride etherate 
Saraev, VV; Kraikivskii, PB; Lazarev, PG; Tkach, VS; Shmidt, FK; , 
1999 
1 
Russian Journal of Coordination Chemistry
ISSN: 1070-3284
EISSN: 1608-3318 
MAIK NAUKA/INTERPERIODICA 
NEW YORK 
204-208 
WOS:000079710700010 
The results of EPR study of the mechanism of oxidation of tetrakis(triphenylphosphine)nickel(0) and his (triphenylphosphine) (pi-ethylene)nickel(0) with boron trifluoride etherate are reported. It is shown that the reaction of Ni(PPh3)(4) with BF3 . OEt2 results in the oxidative addition of the latter with the formation of the Ni(II) complex, which reacts with the Ni(0) complex to form the Ni(I) compounds containing valence Ni-F and Ni-B bonds. As a result of the metathesis reaction with boron trifluoride etherate, Ni(I) borides transform into Ni(I) fluorides, which, in the presence of excess BF3 . OEt2, convert into the cationic monomeric paramagnetic Ni(I) complexes. In the presence of coordinated olefins (ethylene or styrene), the reaction of Ni(II) with Ni(0) slows down, and the Ni(II) complexes are accumulated in the system. It is assumed that the coordinated olefin is inserted into the Ni-B bond to form stable Ni(II) sigma-alkyl complexes.