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Intramolecular cyclodehydration of 3‐arylpropionic acids catalyzed by heteropoly acids was investigated for the first time. Several 3‐arylpropionic acids were refluxed and dehydrated in chlorobenzene in the presence of 0.2 equivalent of heteropoly acids, and 1‐indanones were obtained in good yield. At the same time, intermolecular Friedel–Crafts acylation were observed in this experiment.
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Lan et al. (2007) studied this question.
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