in benzene (Ar); addn. of soln. of org. compd. in C6H6 to Ni-complex, standing (20 h, 22°C); evapn. to dryness, pptn. on addn. of ether, filtration, washing (ether), drying (vac.);

in benzene (Ar); addn. of soln. of org. compd. in C6H6 to soln. of Ni-complex in C6H6, standing (2 h, 22°C); evapn. to min. vol., pptn. on addn. of ether, filtration, washing (ether), drying (vac.); elem. anal.;