carbon monoxide in not given byproducts: 4-valerylpyridine; Irradiation (UV/VIS); irradn. of W complex under CO atmosphere;

in 2-methyl cyclohexane Irradiation (UV/VIS); low-intensity irradn. between 313 and 490 nm of methylcyclohexane (degassed) 0.02 M soln. of W complex; column chromy. (Al2O3), recrystn. from hexane-ethyl acetate; elem. anal.;