tetrahydrofuran in tetrahydrofuran Irradiation (UV/VIS); Ar or N2 atmosphere; irradiation of W(CO)6 in THF soln. (quartz lamp 200 W, 5°C, 4.5 h), add. of PhNO; removal of solvent (standing in argon, 20°C, 20 h), extn. (benzene), chromy. (silica gel, benzene);

in toluene 35.4°C;