in diethyl ether dissolving of Ni(TBC) in Et2O, bubbling of CO gas through the soln., color change to clear yellow;

O2 in benzene dissolving of Ni(TBC) in benzene, bubbling of O2 through the soln.; further product: unidentified Ni compd.;

in diethyl ether dissolving of Ni(TBC) in Et2O, bubbling of CO gas through the soln., color change to clear yellow;

in neat (no solvent) a. grinding of Ni(TBC) in a mortar with I2 under Ar, repeated addn. of seeral drops of Et2O; b. diffusion of I2 vapor into a flask containing Ni(TBC) (4 d);