A process for allowing an oxidation reaction efficiently to produce an object aromatic carboxylic acid with an efficient productivity by improving a catalyst activity even in the presence of a relatively small amount of a catalyst is provided.
The process comprises oxygen-oxidizing an aromatic compound having an alkyl group and/or an alkylene group as a substrate in the presence of a catalyst containing a cyclic imino unit having an N—OR group (wherein R represents a hydrogen atom or a protecting group for a hydroxyl group) and a transition metal co-catalyst (a cobalt compound, a manganese compound, and a zirconium compound) to produce the aromatic carboxylic acid corresponding to the aromatic compound. The oxidation reaction is carried out with feeding a mixture of the catalyst and at least one member selected from the group consisting of the substrate, a reaction intermediate (e.g., a ketone and an aldehyde), and a reaction product (e.g., water and an aromatic carboxylic acid) successively or continuously to the oxidation reaction system. The oxidation reaction may usually be carried out in the absence of a reaction solvent. The reaction may be conducted with removing water produced by the reaction from the reaction system.
提供了一种使氧化反应能够高效产生一种芳香
羧酸对象的过程,通过改善催化剂的活性,即使在存在相对少量催化剂的情况下也能实现高效产出。该过程包括在催化剂的存在下,氧氧化具有烷基基团和/或烷烯基团的芳香化合物作为底物,其中催化剂含有具有N—OR基团(其中R代表氢原子或羟基的保护基团)的环状
亚胺单元和过渡
金属辅助催化剂(
钴化合物,
锰化合物和
锆化合物),以产生与芳香化合物相对应的芳香
羧酸。氧化反应是通过将催化剂和底物、反应中间体(例如酮和醛)以及反应产物(例如
水和芳香
羧酸)的混合物连续或逐步地加入氧化反应系统中来进行的。通常可以在没有反应溶剂的情况下进行氧化反应。反应可以通过从反应系统中除去反应产生的
水来进行。