Preparation of alkanedioic derivatives
CA 2099198 A1 · Owner: Drent, Eit · Inventors: Drent, Eit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of alkanedioic derivatives, for example alkanedioic diesters by, reaction of an aliphatic conjugated diene such as butadiene with carbon monoxide and a hydroxyl group-containing compound such as a C1-6 alkanol in the presence of a catalyst system comprising a) a source of cationic palladium, b) a first bidentate diphosphine ligand having electron-withdrawing substituents on the phosphorus atoms, c) a second bidentate diphosphine ligand having electron-releasing substituents on the phosphorus atoms, and d) a source of an anion. VM/T1850FF
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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 June 25, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2015.
- 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.