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Abstract
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Silica-bonded S-sulfonic acid is employed as a recyclable catalyst for the synthesis of naphthoxazinone
derivatives from the reaction of ?-naphthol, aromatic aldehydes and urea at 150?C under solvent-free
conditions. The heterogeneous catalyst was recycled for five runs after the reaction of ?-naphthol, benzaldehyde
and urea without losing its catalytic activity.
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