High activity metal carbene metathesis catalysts generated using a thermally activated n-heterocyclic carbene precursor
CA 2441500 C · Owner: Bell, Andrew · Inventors: Morgan, John P.; Bell, Andrew; Moore, Jason L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a method of making a ruthenium or osmium carbene catalyst having an imidazolidine in the presence of an olefin with the application of energy. The resulting metal compound has two carbene ligands one from the original carbene, the other from the imidazolidine. The imidazolidine has bulky protecting groups in the two positions adjacent to the carbene carbon. The method of making the imidazoline from the salt in the presence of a base and chloroform is also disclosed.
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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 March 25, 2002 and granted May 17, 2016. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 2024.
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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.