Method for producing (aryl substituted) carboxylic acid or its salt
CA 1303060 C · Owner: Shimizu, Isoo · Inventors: Inomata, Yoshihisa; Matsumura, Yasuo; Shimizu, Isoo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An effective method for producing highly pure (aryl substituted) carboxylic acid such as (aryl substituted) propionic acid or a salt thereof, which comprises the steps of: oxidizing (aryl substituted)aldehyde in an acidic phase in the presence of hypohalogenite; and bringing the oxidized product obtained in the preceding step into contact in a liquid phase with hydrogen in the presence of a catalyst of transition metal of the group VIII in the periodic table. The product of the present invention can be used as an intermediate material for preparing anti-inflammatory medicines of 2-(4isobutylphenyl)propionic acid (Ibuprofen) and 2-(3benzoylphenyl)propionic acid (Ketoprofen).
Read the whole patent
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 June 9, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.