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.;