Abstract
2-Benzopyrylium salts containing heterocyclic substituents have not previously been known. In order to obtain 2-benzopyrylium salts containing thiophene substituents in position 3, we have studied the acylation of 3,4-dimethoxybenzyl 2-thienyl ketone (I), which was obtained with a yield of 36% by the acylation of thiophene (at 75° C) with homoveratric acid in the presence of polyphosphoric acid (PPA). Compound I forms yellow crystals with mp 74–75° C (from benzene), bp 220° C (6mm). Found %: C 63.40; H 5.38; S 13.55. C11H13O3S. Calculated %: C 64.12; H 5.34; S13.21.
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