PREPARATION OF BIS(AMINOPHENYL) ETHERS FROM (N- ACETYL) AMINOPHENOLS OR THEIR PHENOLATES

摘要

PREPARATION OF BIS(AMINOPHENYL) ETHERS FROM (N-ACETYL)AMINOPHENOLS OR THEIR PHENOLATES Bis(aminophenyl) ethers are prepared by effecting condensation reaction of an (N-acetyl)amino-phenol or the corresponding sodium or potassium (N-acetyl)aminophenate with a halonitrobenzene under condensation reaction conditions to form an (N-acetyl)-aminophenylnitrophenyl ether and hydrogenating the nitro group thereof under nitro- group hydrogenation conditions to form an (N-acetyl)bis(aminophenyl) ether. The latter compound is hydrolyzed with aqueous mineral acid under acid hydrolysis conditions to form an acidic aqueous dispersion of the bis(aminophenyl) ether product, which can readily be recovered from the disperson. Final bis(aminophenyl) ether products thus prepared are typically of high purity and excellent color properties, i.e., substantially colorless.