A process for the preparation of aromatic carboxylic acids or their salts comprises heating carboxyl-free aromatic compounds and aromatic carboxylic acid salts whose basic structures differ from those of the aromatic compounds, or heating polycyclic aromatic compounds with three or more rings and monocyclic or bicyclic aromatic carboxylic acid salts, under carbon dioxide pressure in the presence of one or more metal compounds selected from group (a) of compounds of zinc, cadmium, and thallium and one or more compounds selected from group (b) of compounds of cesium, Group II metals, and Group III a metals to effect the intermolecular transfer of the carboxyl groups.
制备芳香族
羧酸或其盐的工艺包括加热不含羧基的芳香族化合物和基本结构不同于芳香族化合物的芳香族
羧酸盐,或加热具有三个或三个以上环的多环芳香族化合物和单环或双环芳香族
羧酸盐、在
二氧化碳压力下,在一种或多种选自(a)组
锌、
镉和
铊化合物的
金属化合物和一种或多种选自(b)组
铯、第二类
金属和第三类
金属化合物的化合物存在下,实现羧基的分子间转移。