Ones, thiones, and N-oxides: an exercise in imidazole chemistry.

General Procedure: 1-Propylimidazole-N-oxide (2a) 1 (1.0 g, 4.1 mmol) and 1,3,5-tripropylhexahydro-1,3,5triazine (0.5 g, 2.4 mmol) were dissolved in ethanol (20 mL). The reaction mixture was heated to reflux for 10 h. The light brown solution was cooled to room temperature and the solvent removed under reduced pressure. The oily residue solidified upon trituration with diethylether to give 2a as white crystals, yield: 76%.