1: 90 percent / thionyl chloride / 1.) room temp., 20 min.; 2.) 60 deg C, 6 h. 2: 98 percent / aq. NaOH / 1.)room temp., 20 min; 2.) 100 deg C, 2 h. 3: 98 percent / POCl3 / 1 h / Heating View Scheme