Preparation of diaminodiphenyl ethers

Details Preparation of diaminodiphenyl ethers Preparation of diaminodiphenyl ethers

1982-05-10

1985-09-03

Shaver, Paul F.

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

Organic compounds

Amino nitrogen containing

564423, C07C 8511

Patent

active

045394288

ABSTRACT:
Diaminodiphenyl ethers (DADPE's) are prepared by refluxing sodium or potassium aminophenate with chloronitrobenzene in dimethylformamide. The reaction mixture is hydrogenated directly without isolating the resulting intermediate product, aminophenyl-nitrophenyl ether, to form the corresponding DADPE, e.g., oxydianiline (ODA). The DADPE is crystallized from the hydrogenated reaction mixture in the presence of an aliphatic alcohol, which may be added to the reaction mixture prior to, during, or after hydrogenation. The resulting crystallized DADPE is typically of high purity and excellent color.

REFERENCES:
patent: 1574337 (1926-02-01), Bogert
patent: 3140316 (1964-07-01), Towle
patent: 4222962 (1980-09-01), Pellegrin

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