molybdenum hexacarbonate in tetrahydrofuran 0.666667 h; Heatingvar.: solvent, temperature, time, reagent;

in 1,4-dioxane under Ar; mixt. of Cr-complex and triene in dioxane refluxed (6 h); filtration (SiO2), evapn., column chromy. (degassed silica, petrol ether/diethyl ether), crystn. (diethyl ether/petrol ether); elem. anal.;

in tetrahydrofuran under Ar; addn. of triene in THF to Cr-complex, kept (40°C, 18 h); filtration (SiO2), evapn., column chromy. (degassed silica, petroleum ether/diethyl ether);