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Natural and synthetic phosphates were used as heterogeneous catalysts to promote the Friedel–Crafts reaction between 5-bromohydantoin and aromatic compounds. In the case of phenol, ortho and para isomers were always obtained. Fluoroapatite (FAP) and natural phosphate (NP) lead to the best selectivity. However, the best overall yield of 5-(hydroxyphenyl)hydantoin was obtained when hydroxyapatite (HAP)...
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