1: 79 percent / Li / diethyl ether / 5.5 h / 40 - 45 °C 2: Adams catalyst / diethyl ether 3: 44 percent / cuprous chloride, p-toluenosulfonic acid / benzene / 24 h / Heating View Scheme

toluene-4-sulfonic acid in benzene 12 h; Heating;

1: 79 percent / Li / diethyl ether / 5.5 h / 40 - 45 °C 2: Adams catalyst / diethyl ether View Scheme