potassium tert-butylate in dimethyl sulfoxide 0.25 h; Ambient temperature;

1: 54 percent / sodium hydroxide / H2O / 48 h / 120 °C 2: 57 percent / potassium tert-butoxide / dimethylsulfoxide / 0.25 h / Ambient temperature View Scheme

lithium aluminium tetrahydride in diethyl ether 1 h; Heating;