| abstract |
The invention provides a method for preparing p-phenylenediamine from aniline. The method includes the following steps: protecting the amino group on the aniline with a p-toluenesulfonyl group, then mixing with an amino donor, an oxidant and a catalyst Ru-Cu/TS-1 to undergo an ammoniation reaction, and after deprotection, the terephthalic acid is separated and obtained amine. The invention adopts a protecting group strategy to protect the amino group on the aniline with p-toluenesulfonyl group, induces and activates the C-H bond at the para-position of the benzene ring, and uses the catalyst Ru-Cu/TS-1 to catalyze the ammoniation reaction, which can greatly improve the ammoniation The efficiency and selectivity are improved, the yield and purity of p-phenylenediamine are improved, the reaction conditions are mild, and the selectivity is good, which is a green and environmentally friendly synthetic route. |