Preparation method of 5-carboxyl benzotriazole

The invention discloses a preparation method of 5-carboxybenzotriazole, and relates to the technical field of chemical synthesis, and the preparation method comprises the following steps: taking 3-nitro-4-aminobenzoic acid as a raw material, and carrying out nitro reduction reaction on the raw material and amide under the action of a catalyst to obtain 3, 4-diaminobenzoic acid; 3, 4-diaminobenzoic acid and sodium nitrite are subjected to a nitrosation reaction under the action of a catalyst, and 5-carboxyl benzotriazole is obtained. The synthetic route is short, equipment investment is greatly reduced, reaction conditions are mild, high-temperature and high-pressure reaction is not needed, the product yield is high, the purity is good, the total yield can reach 90% or above, the production cost is low, the efficiency is high, and industrial production is easy to achieve. 本发明公开了一种5-羧基苯并三氮唑的制备方法，涉及化工合成技术领域，包括以下步骤：以3-硝基-4-氨基苯甲酸为原料，在催化剂作用下，与酰胺发生硝基还原反应，得到3,4-二氨基苯甲酸；将3,4-二氨基苯甲酸与亚硝酸钠在催化剂作用下，发生亚硝化反应，得到5-羧基苯并三氮唑。本发明合成