Process for the preparation of 4,4'-bis(4-aminophenoxy)-diphenyl

Details Process for the preparation of 4,4'-bis(4-aminophenoxy)-diphenyl Process for the preparation of 4,4'-bis(4-aminophenoxy)-diphenyl

1990-12-28

1992-06-02

Cintins, Marianne

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C07C21306, C07C21576, C07C21790

Patent

active

051188481

ABSTRACT:
High purity 4,4'-bis(4-aminophenoxy)diphenyl sulfone is prepared from p-aminophenol, alkali metal hydroxide and 4,4'-dihalodiphenyl sulfone by using a molar ratio of alkali metal hydroxide: 4-aminophenol in the range of 1.0-1.1:1.0 and a molar ratio of 4-aminophenol: 4,4'-dihalodiphenyl sulfone in the range of 2.005-2.05:1.0 and by using a dialkylamide or N-alkyl lactam as a solvent. Pristine products (no-recrystallization) of 99.0% purity having melting points above 195.degree. C. are obtained.

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