Minimization of ligand degradation products, or reversion of same to useful phosphine ligands
CA 2530739 C · Owner: Dow Technology Investments Llc · Inventors: Morrison, Donald L.; Abatjoglou, Anthony G.; Briggs, John R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the minimization of phosphonium ion ligand degradation products formed during reaction of a polyunsaturated olefin or an unconjugated functionalized olefin in the presence of a transition metal-triorganophosphine ligand complex catalyst to form as a product by-product, or intermediate , product a conjugated functionalized olefin having a carbon-carbon double bond conjugated to an a-electron~withdrawing group such as, an a,.szlig.-, unsaturated aldehyde ketone, ester, acid, or nitrile. The minimization process involves conducting the reaction under selected conditions of conversion, temperature, pressure, or a combination thereof; and/or by selecting a triorganophosphine …
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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 28, 2004 and granted September 25, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 28, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2026.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.