Catalysts for nucleophilic substitution, synthesis thereof, composition containing same and use thereof
CA 2442782 A1 · Owner: Rhodia Chimie · Inventors: Cristau, Henri-Jean; Schanen, Vincent; Taillefer, Marc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns novel catalysts for aromatic nucleophilic substitution. Said catalysts are compounds of the general formula (I) wherein: R¿1?, R¿2?, R¿3?, R¿4?, R¿5?, and R¿6? identical or different, are selected among hydrocarbon radicals; the Pn's advantageously the same, are selected among metalloid elements of column V of a period higher than nitrogen; Z is a metalloid element of column V advantageously distinct from Pn; preferably a nitrogen (N P, As, Sb). The invention is applicable to organic synthesis.
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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 April 12, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 12, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2024.
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Timeline
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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.