in benzene Addn. of equimolar mixt. of azides in anhyd. benzene to soln. of borane in 10 min at room temp., standing of mixt. overnight at room temp.; Treating with NaOH, sepg. of org. phase, drying (K2CO3), evapn. of solvent in vac., distn. of oil, yield: 72 percent, GC.;