in acetonitrile refluxing;;

Na in toluene (N2); soln. of B compd. in toluene was added to molten Na in toluene at 110°C; mixt. was refluxed overnight; evapd.; dried (vac.);

in acetonitrile refluxing;;

sodium cyanide in ammonia N2-atmosphere; molar ratio borane:NaCN=1:1, stirring in excess NH3 at -44°C for 4 h; solvent removal (vac.), treatment with C6H6 for 20 min, filtration, evapn. of filtrate, sublimation (vac., 50°C);

in sodium hydroxide at pH 12; extd. (CH2Cl2), org. layer dried (MgSO4), concd., dild. (CH2Cl2), evapd.;

sodium hydroxide in sodium hydroxide; dichloromethane soln. Me3N*BH2CN and Et3OBF4 in Ch2Cl2 refluxed under N2 for 24 h, mixt. cooled to 0°C and NaOH added slowly to pH 8 and mixt. stirred for 1 h at room temp.; org. layer separated and dried over MgSO4, solvent removed in vacuo, liquid distilled under vac. with min. heating; elem. anal.;