1: 89 percent / sodium borohydride / ethanol; H2O / 1 h / 20 °C 2: 1.) sodium hydroxide, sodium nitrite, 2.) silver nitrate / 1.) ethanol, 20 deg C, 20 min , 2.) 30 min, View Scheme

sodium tetrahydroborate in ethanol; water T=20°C; 1 h;