in benzene under Ar atm. using Schlenk techniques; a flask was charged with Ni complex in benzene; vinyl chloride was condensed into the tube at -78°C under vac.; soln. stirred for 4 ds at 50°C; cooled to room temp.; volatiles removed (vac.); filtered; filtrate was left to stand at 25°C for 24 h; red brown crystals pptd. and sepd. by filtration; filtrate heated to 50°C for 4 ds; filtered; condensed under vac.; cooled to -36°C; dark red crystals;