in benzene-d6 room temp.; followed by NMR;

in toluene byproducts: C7H8; Ar atm.; molar ratio ligand:Cr complex 1:2, stirring (48 h, room temp.); evapn. (vac.), washing (petroleum ether), crystn.;

Irradiation (UV/VIS); in presence of light, process is rapid in org. solvents;