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