Method for preparing of mono or di-2-substituted cyclopentanone
CA 2173618 A1 · Owner: Rhone-Poulenc Agrochimie · Inventors: Crochemore, Michel; Clavel, Jean-Louis; Buforn, Albert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method for the preparation of mono or di_2-substituted cyclopentanone characterized in that it consists in performing in sequence four stages (a) to (d) which can be successively carried out if desired, in the same reactor: (a) addition of alkyl acetoacetate to 1,3-butadiene optionally 2-substituted; (b) the addition product formed is subjected to deacylation following by an alkaline hydrolysis reaction and acidification to produce a carboxylic monacid having 6 carbon atoms in its main chain; (c) said monacid is subjected to hydroxycarbonylation to produce an alpha omega -carboxylic diacid having 6 carbon atoms in its mains chain; and (d) said diacid is subjected to cyclizing …
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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
- Filed October 4, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 4, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 2016.
- 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.