| 摘要 |
PURPOSE:To improve yield and purity of the titled compound useful as a production intermediate for color photographic material, etc., by reacting 1-hydroxy-2- naphthoic acid with a dialkyl sulfate in the presence of an alkali metal carbonate using an aliphatic ketone as a solvent. CONSTITUTION:The objective compound can be produced by reacting 1- hydroxy-2-naphthoic acid with a dialkyl sulfate at 30-110 deg.C, preferably 50-80 deg.C using an aliphatic ketone as a solvent in the presence of an alkali metal carbonate or alkali metal bicarbonate. The amount of dialkyl sulfate is 1.0-1.5mol, preferably 1.0-1.2mol per 1mol of 1-hydroxy-2-naphthoic acid. The amount of the solvent such as acetone, methyl ethyl ketone, etc., is preferably 3.0-6.0pts. wt. per 1pt.wt. of 1-hydroxy-2-naphthoic acid and that of potassium carbonate, etc., is preferably 0.5-1.5mol per 1mol of the above raw material. |
