Preparation of diamino diphenyl ethers

Details Preparation of diamino diphenyl ethers Preparation of diamino diphenyl ethers

C - Chemistry, Metallurgy

07

C

260/597.7

C07C 93/14 (1985.01)

Patent

CA 1211468

PREPARATION OF DIAMINO DIPHENYL ETHERS Abstract of the Disclosure 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.

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