Preparation of bis(aminophenyl) ethers from (n- acetyl) aminophenols or their phenolates
CA 1248139 A · Owner: Mallinckrodt, Inc. (Delaware) · Inventors: Inskip, Ervin B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Bis(aminophenyl) ethers are prepared by effecting condensation reaction of an (N-acetyl)aminophenol 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 …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 3, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 3, 2006.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.