METHOD OF PRODUCING 4,4-BIS(4-AMINOPHENOXY)DIPHENYLSULPHONE Russian patent published in 2012 - IPC C07C315/04 C07C317/34 C07C317/22 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing 4,4'-bis(4-aminophenoxy)diphenylsulphone of formula I:

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The method involves reaction of 4,4'-dichlorodiphenylsulphone II with a sodium salt of n-aminophenol III. The reaction is carried out in aprotic nonpolar solvents of the aromatic series in the presence of phase-transfer catalysts - pyridinium salts Q⁺Hlg^- (where Q=Alk₂NPyAlk'; Hig=Cl, Br), with reactants in the ratio II:III:NaOH:Q⁺Hlg=1.0:2.0:(2.0-2.01):0.01 mol, while stirring, at temperature 160-170°C and holding for 4-6 hours. The n-aminophenol III is added to a mixture of solvents containing aqueous sodium hydroxide solution and toluene, mixed with a water separator while boiling, collecting water in form of an azeotrope with toluene and distilling toluene. 4,4'-dichlorodiphenylsulphone and a catalyst are added to the obtained reaction mass and the mother solution is recycled after extracting the product.

EFFECT: novel method of obtaining said composition with high output at low technological and material expenses.

1 cl, 2 ex