HCl in diethyl ether dry HCl in ether added to Ipc2BH-THF suspension at -78°C, stirring 15 min, warming to 0°C with stirring for complete soln. and gas evoln. ceased (2 h); solvent removal, cooling, prod. solidified, crystn. from pentane;

sodium tetrahydroborate; boron trichloride in ethylene glycol dimethyl ether T=10°C; 1.) 10 deg C, 15 min; 2.) RT, 1 h; 3.) 40 deg C, 1 h;

Me2S*BH2Cl in tetrahydrofuran T=-10 - 20°C; Inert atmosphere;

in diethyl ether T=0 - 20°C;

hydrogenchloride; methanol; sodium hydroxide; trimethylaluminum; hydroxylamine-o-sulphonic acid Yield given. Multistep reaction;