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Sulphamic acid (H2NSO3H) was found to be an efficient catalyst for the multicomponent condensation reaction of β‐naphthol, aromatic aldehydes and urea or amides to afford the corresponding α‐amidoalkyl‐β‐naphthols in good yields. The remarkable features of this new procedure are high conversions, short reaction time, clean reaction profiles and simple experimental and work‐up procedures.
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Nagawade et al. (2007) studied this question.
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