1: 1.) KOH, HONH2*HCl / 1.) MeOH, water, 2.) MeOH, water, 21 h, reflux 2: 55 percent / PCl5 / diethyl ether / 20 h / Ambient temperature; adding 0-5 deg C 3: 50 percent H2SO4 / 3 h / 70 - 80 °C View Scheme