Process for the preparation of diarylphosphino pyridines
CA 2061129 A1 · Owner: Verbrugge, Pieter Adriaan · Inventors: Suykerbuyk, Jacoba Catherina Lucia Johanna; Verbrugge, Pieter Adriaan; Klusener, Peter Anton August
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 a diarylphosphino pyridine comprising the steps of: a) reacting a triaryl phosphine with about two equivalents of an alkali metal in a substantially aprotic solvent medium to form an alkali diarylphosphide and an alkali aryl; b) selectively eliminating the alkali aryl formed; c) reacting the alkali diarylphosphide with about one equivalent per halide group of an optionally substituted pyridyl halide; and, d) separating the diarylphosphino pyridine formed. C13/T1593FF
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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 February 13, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2014.
- 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.