pentacarbonyliron(0) in tetrahydrofuran T=30°C; 3 h; Irradiation; Title compound not separated from byproducts;

T=20 - 25°C;

in tetrahydrofuran Irradiation (UV/VIS); Nitroso compound in THF under N2 is stirred, metal carbonyl in THF is added, the soln. is irradiated (sunlamp photolysis) for a period of 3 h at 30°C.; final purifn. by chromy. on silica gel, elution with 19/1 hexane/ethyl acetate provides two fractions;