| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing the subject 2,2-bis(3-amino-4- hydroxyphenyl)propane in high yield and high purity by a series of processes comprising the production of a dinitro moiety of bisphenol A without leaving any unreacted nitrate ion and the subsequent reduction of the dinitro moiety without leaving the unreacted metal of the catalyst. SOLUTION: To an acetic acid solution of bisphenol A is added dropwise a concentrated nitric acid at first at 21-100 deg.C in an amount smaller than the requirement, and subsequently at 0-20 deg.C the remainder of the concentrated nitric acid to obtain the corresponding dinitro moiety, and then this dinitro moiety is reduced in the presence of a palladium catalyst and hydrazine in an alcoholic solvent. After the reduction, the whole solvent including the hydrazine is removed to obtain the objective 2,2-bis(3-amino-4-hydroxyphenyl)propane. |
