1: 1.) sodium sulphate, yellow mercuric oxide, Celite, potassium hydroxide / 1.) diethyl ether, ethanol, 3 h, 2.) ethanol, diethyl ether, 6 h 2: 87 percent / benzene / 4 h / Ambient temperature 3: 86 percent / water, hidrochloric acid / acetic acid / 1 h / Heating View Scheme