A process for the manufacture of benzoic acid derivatives is described. The process is based on the reaction of a toluene derivative in a liquid phase oxidation with an oxygen containing gas in the presence of a phase-transfer catalyst (a), a transition metal salt (b) and traces of a polar solvent, such as water, the molar ratio between (a) and (b) being in the range of between 0.25:1 to 1.5:1. The phase-transfer catalyst is selected from quaternary ammonium and phosphonium salts, having a total carbon atoms in the range of 17 to 58, the anion bound thereto being selected from Br⁻, F⁻, Cl⁻, OH⁻, CH₃COO⁻ or HSO₄⁻. The benzoic acid derivatives produced are characterized by their very high purity and high conversion reaching generally values of above 95%.
描述了一种制造
苯甲酸衍
生物的工艺。该工艺基于
甲苯衍
生物在相转移催化剂(a)、过渡
金属盐(b)和微量极性溶剂(如
水)存在下与含
氧气体的液相氧化反应,(a)和(b)之间的摩尔比在 0.25:1 至 1.5:1 之间。相转移催化剂选自季
铵盐和
鏻盐,其总碳原子数在 17 至 58 之间,与之结合的阴离子选自 Br-、F-、Cl-、OH-、CH₃COO- 或 HSO₄-。生产出的
苯甲酸衍
生物具有纯度高、转化率高的特点,一般可达到 95% 以上。