ammonium acetate T=20°C; 0.5 h; Neat (no solvent);

ammonium acetate in neat (no solvent) T=60°C; Green chemistry;

1: With cellulose sulfuric acid in neat (no solvent) T=80 - 100°C; Hantzsch Pyridine Synthesis; 2: With cellulose sulfuric acid in neat (no solvent) Hantzsch Pyridine Synthesis;

ammonium hydroxide in water Hantzsch pyridine synthesis; 5 h; Reflux;