A rapid and efficient one‐pot method for the synthesis of 1‐amidoalkyl‐2‐naphthols has been developed in the presence of mixed‐addenda vanadium(V)‐substituted polyoxomolybdates including: H3+xPMo12-xVxO40 (x=1‐3) heteropolyacids (HPAs) as recyclable catalysts under solvent‐free conditions. In all cases heteropolyacid with x = 3 gave the highest yield under solvent‐free conditions.
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Bamoharram et al. (2010) studied this question.