Acyloxy aromatic carboxylic acids, e.g., 4-acetoxybenzoic acid, are prepared by oxidizing with oxygen an acyloxy aromatic ketone, e.g., 4-acetoxyacetophenone in the presence of transition metal ions as catalyst and a co-reductant. The acyloxy aromatic ketone may be prepared by acylating a hydroxy aromatic ketone, e.g., 4-hydroxyacetophenone, which has the effect of "masking" the hydroxyl group of the ketone in a manner necessary to effect the subsequent transition-metal catalyzed oxidation of the ketone to the acyloxy aromatic carboxyic acid.
酰氧基芳香族
羧酸,如
4-乙酰氧基苯甲酸,是在过渡
金属离子作为催化剂和共还原剂的存在下,通过
氧气氧化酰氧基
芳香族酮,如 4-乙酰氧基
苯乙酮来制备的。酰氧基
芳香族酮可通过酰化羟基
芳香族酮(如
4-羟基
苯乙酮)来制备,其效果是 "掩盖 "酮的羟基,使其在过渡
金属催化下氧化成酰氧基芳香族
羧酸。