in diethyl ether a suspn. of Ni-complex in ether was treated with COD at -78°C under Ar; ppt. was filtered off, washed with cold ether, dried at 20°C under vac.; IR identification;

carbon monoxide in tetrahydrofuran a THF soln. of Ni-complex was treated with CO at -78 - -40°C for20 min; identified by IR spectral data;

With  cyclooctatetraene in  tetrahydrofuran  at -78°C under Ar;