in 1,4-dioxane

in toluene 35.4°C;

THF in tetrahydrofuran Irradiation (UV/VIS); N2-atmosphere; photolysis of hexacaronyl, addn. of ligand; evapn., sublimation off of unreacted hexacarbonyl (60°C, vac.), washing (cold hexane), chromy. (SiO2, hexane), recrystn. (hexane);