2-(2,6-Diisopropylphenyl)-1-methylimidazo[1,5-a]quinolin-2-ium Tetrafluoroborate

A new heterocyclic compound, 2-(2,6-diisopropylphenyl)-1-methylimidazo[1,5-a]quinolin-2-ium tetrafluoroborate 1 was obtained from its precursor, N-(2,6-diisopropylphenyl)-N-(quinolin-2-ylmethyl)acetamide 2, by POCl3-mediated cyclization. For the first time, tertiary acetamide 2, the precursor of 1, was synthesized by using commercially available starting materials. The structure of 1 was unquestionably confirmed by 1H, 13C, 2D-NMR, and IR spectroscopies and mass spectrometry. Its optical properties were also studied.