hydrogen bromide in pentane 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.;

in pentane Under stirring a strong stream of HBr is bubbled at 0°C for 10 min to the cooled soln. of (Me2N)P(c-Hex)(Cr(CO)5).; Solvent is evapd. at room temp. in vac., residue is digested with pentane, filtered, filtrate is dried to dryness in vac., residue is taken off in pentane, chromy. (silica gel, pentane), elem. anal.;