SOLUTION FOR SYNTHESIS OF 4-AMINODIPHENYLAMINE, METHOD FOR ITS PREPARING AND METHOD FOR SYNTHESIS OF 4-AMINODIPHENYLAMINE Russian patent published in 2006 - IPC C07C209/36 C07C211/54 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a solution used in synthesis of 4-aminodiphenylamine. Method involves the condensation reaction of nitrobenzene with aniline followed by catalytic hydrogenation of prepared mixture of 4-nitroso- and 4-nitrodiphenylamine tetramethylammonium salts containing aniline, potassium chloride and water. The solution contains additionally aniline tetramethylammonium salt of the formula: C₆H₅NHM wherein M represents tetramethylammonium cation (CH₃)₄N⁺ in the following ratio of components, wt.-%: C₆H₅NHM, 18.2-22.6; aniline, 52.0-64.7; water, 11.0-28.4; KCl, 1.4-1.7. Method for preparing the claimed solution used for synthesis of 4-aminodiphenylamine involves dissolving tetramethylammonium chloride in water, addition of equivalent amount of potassium hydroxide, removal of potassium chloride excess by filtration and addition of aniline to filtrate. Method for preparing 4-aminodiphenylamine by using the claimed solution involves the condensation reaction of aniline tetramethylammonium salt of the formula C₆H₅NHM wherein M represents tetramethylammonium cation (CH₃)₄N⁺ with nitrobenzene in aniline medium and the following distilling off water to obtain a mixture of 4-nitroso- and 4-nitrodiphenylamine tetramethylammonium salts. By termination of the condensation reaction tetramethylammonium hydroxide is removed and the remaining mixture of 4-nitroso- and 4-nitrodiphenylamine is hydrogenated catalytically to 4-aminodiphenylamine in medium consisting of aniline, toluene and water. Using the claimed solution provides increasing the yield of 4-aminodiphenylamine, and to simplify and reduce cost of the process.

EFFECT: improved method for preparing and synthesis.

4 cl, 4 ex