pyridine in pyridine in presence of NaBPh4, stirring for several h; pptn. on water addn., collection, sublimation off of W(CO)6 (vac., 50°C), extn. into hexane, recrystn. (hexane); elem. anal.;

in further solvent(s) in presence of NaBPh4, stirring in 4-methylpyridine for several h; pptn. on water addn., collection, sublimation off of W(CO)6 (vac., 50°C), extn. into hexane, recrystn. (hexane); elem. anal.;

in benzene in presence of NaBPh4, stirring for several h; pptn. on water addn., collection, sublimation off of W(CO)6 (vac., 50°C), extn. into hexane, recrystn. (hexane); elem. anal.;

in benzene in presence of NaBPh4, stirring for several h; pptn. on water addn., collection, sublimation off of W(CO)6 (vac., 50°C), extn. into hexane, recrystn. (hexane); elem. anal.;

pyridine in pyridine in presence of NaBPh4, stirring for several h; pptn. on water addn., collection, sublimation off of W(CO)6 (vac., 50°C), extn. into hexane, recrystn. (hexane); elem. anal.;