hydrogen bromide in benzene Under stirring a strong stream of hydrogenhalogenide is bubbled for 10 min through the cooled (0°C) soln. of phosphine complex (inert atmosphere).; Solvent is evapd. at room temp. in vac., residue is digested with pentane, dialkylamminhydrohalogenide is filtered off, filtrate is dried to dryness in vac., recrystn. from pentane (-78°C), elem. anal.;