potassium carbonate in acetone 12 h; Ambient temperature;

1: 44 percent / pyridine / 12 h / Ambient temperature 2: 13 percent / ester of polyphosphoric acid / 0.33 h / Heating 3: 50 percent / KOH / methanol; H2O / 3 h / Heating 4: 75 percent / K2CO3 / acetone / 12 h / Ambient temperature View Scheme

1: 13 percent / ester of polyphosphoric acid / 0.33 h / Heating 2: 50 percent / KOH / methanol; H2O / 3 h / Heating 3: 75 percent / K2CO3 / acetone / 12 h / Ambient temperature View Scheme

1: 50 percent / KOH / methanol; H2O / 3 h / Heating 2: 75 percent / K2CO3 / acetone / 12 h / Ambient temperature View Scheme

1: 44 percent / pyridine / 12 h / Ambient temperature 2: 13 percent / ester of polyphosphoric acid / 0.33 h / Heating 3: 50 percent / KOH / methanol; H2O / 3 h / Heating 4: 75 percent / K2CO3 / acetone / 12 h / Ambient temperature View Scheme

PPA; potassium carbonate 1.) 75 to 80 deg C, 15 h, 2.) acetone, room temp., 12 h; Yield given. Multistep reaction. Yields of byproduct given;