water in tetrahydrofuran; diethyl ether; ethanol to THF soln. of Sn compd. added BH3 (N2, room temp.),refluxed (1 h), added H2O,stirred (30 min),extd. (Et2O), dried (MgSO4),evapd. in vac.,heated with pentane,filtered PhB(OH)2,filtrate evapd.,added Et2O,EtOH soln. of HOCH2CH2NH2 added,refluxed (30 min); filtered hot, complex pptd. by cooling, filtered; PhB(OH)2 recrystd. from H2O; compds. identified by m. p., IR, NMR;