in tetrahydrofuran byproducts: KPF6; glovebox or high-vac. line; addn. of Fe-compd. to soln. of Mo-compd. in THF (-78°C), stirring, warming (0°C, 30 min), warming (25°C); removal of solvent, addn. of benzene, filtration, removal of volatiles, sublimation of ferrocene, crystn. (toluene/pentane); elem. anal.;

in tetrahydrofuran glovebox or high-vac. line; addn. of Fe-compd. to soln. of Mo-compd. in THF (-78°C), stirring, warming (0°C, 30 min), warming (25°C); removal of solvent, addn. of benzene, filtration, removal of volatiles, sublimation of ferrocene, crystn. (toluene/pentane); elem. anal.;