Abstract
Abstract Reaction of homophtalic anhydrid with aliphatic or aryl anhydrids (or acid chlorides) and an appropriate base gives 4-acyl and 4-aroylisochroman-1,3-diones. The structure of these isochroman-1,3-diones was determined by 1H, 13C and 17O NMR spectrometry. In solution, among the three possible tautomers, only the enolic one with exocyclic double bond was observed. These results are in good agreements with AMI calculations ones.
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