I'm looking for information about what the reaction mechanism is that underpins this reaction. If anyone can share some insights it is much appreciated.
In the experimental section it is written
2-Benzoylpyridine (4 mmol, 0.732 g) and ammonium acetate (22 mmol, 1.70 g) was dissolved in acetic acid (30 mL) and followed by the addition of salicylaldehyde (6 mmol, 0.733 g). The reaction was refluxed for 6 h. The resulting solution mixture was cooled to room temperature and cold water was then added to the mixture. The solid was collected by filtration and washed with a small amount of cooled water, which was purified via recrystallization using acetonitrile to give MZC (0.687 g, 60 % yield).