1: acetic anhydride, conc. sulfuric acid / 1.) acetic acid, rt., 20 h; 2.) acetic acid/water, 80 deg C, 30 min 2: 100 percent / pyridine / 15 h / Ambient temperature View Scheme

1: acetic anhydride, conc. sulfuric acid / 1.) acetic acid, rt., 20 h; 2.) acetic acid/water, 80 deg C, 30 min 2: 100 percent / pyridine / 15 h / Ambient temperature View Scheme

1: acetic anhydride, conc. sulfuric acid / 1.) acetic acid, rt., 20 h; 2.) acetic acid/water, 80 deg C, 30 min 2: 100 percent / pyridine / 15 h / Ambient temperature View Scheme

1: acetic anhydride, conc. sulfuric acid / 1.) acetic acid, rt., 20 h; 2.) acetic acid/water, 80 deg C, 30 min 2: 100 percent / pyridine / 15 h / Ambient temperature View Scheme