Preparation of 4-carboxyphenylhydrazine hydrochloride_Kain Industrial Additive

background and overview[1][2] 4-carboxyphenylhydrazine hydrochloride is an important intermediate, especially a pharmaceutical intermediate. the existing technology uses p-aminobenzoic acid as raw material, and is prepared through diazotization reaction, sodium sulfite reduction, and hydrolysis. the synthesis method of the obtained 4-carboxyphenylhydrazine hydrochloride requires a long reaction time, generally requires a yield of only 63-72%, and has…