PROCESS FOR PREPARATION OF .alpha.-AROMATIC GROUP SUBSTITUTED ALKANOIC ACID OR ESTERS THEREOF
CA 1186318 A · Owner: Syntex Pharmaceuticals International Limited · Inventors: Kitajima, Kouji; Tsuchihashi, Genichi; Mitamura, Shuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a process for preparing an alpha-aromatic group substituted alkanoic acid or its ester of the general formula (I), wherein Ar represents an aromatic group and R1 represents a hydrogen atom or a saturated aliphatic group, or Ar and R1 may form a condensed ring together with the carbom atom to which they are bonded; and R2 represents a hydrogen atom, an alkyl group, or a hydroxyalkyl group. In the process an alphasulfonyloxyketone acetal of the general formula (II), wherein R3 and R4, independently from each other represent an alkyl group, or taken together represent an alkylene group; R5 represents a substituted or unsubstituted alkyl group or an aromatic group; and Ar and …
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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 April 30, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 30, 2002.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.