in diethyl ether under Ar, into stirred soln. of C6H4(CH2Br)2 in ether Ni complex introduced at -20°C over 1 h;

in benzene react. of the cyclopropane compd. with the Ni complex in benzene (equimolar quantities) for 24 h under Ar;

in benzene

in benzene

in diethyl ether byproducts: O2, C2H4; addn. a soln. of benzoyl peroxide in ether to a suspn. of Ni-compound in ether at -50°C, stirring for 1 h at 22°C, (Ar); filtn. of ppt. (Ni(OCOPh)2*H2O), washing (benzene, ether), drying in vacuum at 110°C, evapn. of mother soln., addn. of MeOH, filtn. of ppt. (Ni(CO)(PPh3)3, drying in vacuum, evapn. of MeOH, recrystn. of residue (PPh3) from ethanol;

in diethyl ether under Ar, into stirred soln. of C6H4(CH2Br)2 in ether Ni complex introduced at -20°C over 1 h;

in diethyl ether at 20°C;