in diethyl ether adding N-N'-ligand (30percent molar excess) and maleic anhydride to soln./suspn. of dimethyl sulfide complex in diethyl ether, stirring (15 h, room temp.), pptn.; filtering, drying, recrystn. (methylene chloride - diethyl ether);

in N,N-dimethyl-formamide T=136°C; 1 h;

in hexane Kinetics; byproducts: CO; under CO; thermal decay of the Cr-complex in n-hexane at 23°C over a period of 24 h; not isolated, detected by NMR, IR and UV spect.;

in N,N-dimethyl-formamide T=136°C; 1 h;

in diethyl ether T=800°C; P=0.0003 Torr;