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Acylation of 3,4-dimethoxybenzylidene phthalide with aliphatic acid anhydrides in the presence of 70% HClO4 and with aromatic or aliphatic-aromatic acids in polyphosphoric acid gave the previously unknown 3-(2-carboxyphenyl)-2-benzopyrylium salts, which were converted to 3-(2-carboxyphenyl)isoquinolines, isolated in the form of the perchlorates, by the action of ammonium hydroxide.
KeywordsAmmonium Hydroxide Organic Chemistry Anhydride Perchlorate
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