申请人:CELANESE CORPORATION
公开号:EP0170483A2
公开(公告)日:1986-02-05
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。