Process for producing substituted or unsubstituted naphthalic acids and acid anhydrides thereof by oxidation of corresponding acenaphthenes whose naphthalene nucleus may have one or two substituents from the group consisting of halogens, sulfonic acid groups, sulfonate groups, and nitro. The oxidation is performed at 30.degree.-150.degree. C. using molecular oxygen in the presence of (1) at least one heavy metal compound, such as cobalt acetate or manganese acetate, in an amount of 0.005-0.3 mole per mole of said acenaphthenes or a mixture of heavy metal compounds in that amount and a bromine compound in the range of 5.times.10.sup.-5 to 2.times.10.sup.-1 mole/liter of reaction solution as a catalyst and (2) at least one accelerator selected from the group consisting of lower fatty acid anhydrides, ketones and aldehydes, whereby side reactions such as condensation can be suppressed to a satisfactory extent, thereby leading to an improvement in yield of final product. A subsequent treatment of the oxidation product obtained by this process with peroxides, hypohalogenates, or molecular oxygen results in a higher yield.
通过对相应的
乙烯基萘进行氧化反应,可以制备取代或未取代的
萘酸及其酸酐,所述
萘核可能具有卤素、
磺酸基、
磺酸盐基和硝基中的一种或两种取代基。氧化反应在30℃至150℃下进行,使用分子
氧气,在至少一种重
金属化合物的存在下进行,所述重
金属化合物为
乙酸钴或
乙酸锰等,用量为所述
乙烯基萘的0.005-0.3摩尔/摩尔或该量的重
金属化合物混合物,并且在反应溶液中加入5×10-5至2×10-1摩尔/升的
溴化合物作为催化剂;同时,在所述重
金属化合物存在下,加入至少一种从
羧酸酐、酮和醛中选择的加速剂,可以抑制缩合等副反应,从而提高最终产物的产率。通过过氧化物、次卤酸盐或分子
氧气等后续处理氧化产物,可以得到更高的产量。