A benzene polycarboxylic acid represented by the formula: ##STR1## wherein n is an integer of 2 or 3, can be obtained under mild conditions with a high yield and with scarce formation of by-product by reacting a monochlorobenzene polycarboxylic acid represented by the formula: ##STR2## wherein n is an integer of 2 or 3, or its alkali metal salt with carbon monoxide in an aqueous solution of an alkali metal compound in the presence of a carbonylation catalyst with irradiation of ray of 340-400 nm, and subsequently acidifying the reaction solution.
通过在碱
金属化合物的
水溶液中,在340-400纳米的光线辐射下,使用羰基化催化剂反应单
氯苯多
羧酸或其碱
金属盐和
一氧化碳,然后酸化反应溶液,可以在温和条件下高产率地获得由下式表示的苯多
羧酸:##STR1## 其中n是2或3的整数,且副产物形成很少。