Production of methacrylic acid Allylnaphthol

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PROBLEM TO BE SOLVED : To provide a method for efficiently producing allyl methacrylate by a continuous reaction. SOLUTION : The allyl methacrylate is produced by subjecting 2-allyl hydroxyisobutyrate to continuous dehydration in gas phase, usually at 100-400 deg.C and at an atmospheric pressure using a phosphate of a rare-earth element as a catalyst. The catalyst phosphate of the rare-earth element is prepared by precipitation after mixing an aqueous solution of salts of the rare-earth element with almost same number of moles of phosphoric acid as the salts.