hydrogenchloride Ambient temperature;

sulfuric acid 3 h;

1: 68 percent / SOCl2 / 1) 90-100 deg C, 3 h, 2) 110-120 deg C, 5 h 2: 93 percent / diethyl ether / 1) ice-bath temperature, 1 h, 2) up to r. t., overnight 3: 55 percent / 0.5 N aq. H2SO4 / 3 h View Scheme

1: 93 percent / diethyl ether / 1) ice-bath temperature, 1 h, 2) up to r. t., overnight 2: 55 percent / 0.5 N aq. H2SO4 / 3 h View Scheme

1: 1.) KOH / 1.) 0-5 deg C, 5 min, 2.) 0-5 deg C, 4 h 2: 80.5 percent / 4 N aq. HCl / Ambient temperature View Scheme