sodium tetrahydroborate in dimethyl sulfoxide T=100 - 110°C; 3 h;

1: 38.7 percent / NaBH4 / dimethylsulfoxide / 3 h / 100 - 110 °C 2: 95.7 percent / ferric chloride*6 H2O / benzene; H2O / 3 h / Ambient temperature View Scheme