α→β Rearrangements of naphthyl ketones under Friedel–Crafts acylation conditions

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Abstract
The intramolecular acylation of the acid (I) by polyphosphoric acid (PPA) affords the kinetically controlled α-naphthyl ketone (II) and/or the thermodynamically controlled β-naphthyl ketone (III); (II) rearranges quantitatively to (III) with PPA at 120°.