The preparation of arylphosphines
CA 2329770 A1 · Owner: Chirotech Technology Limited · Inventors: Lennon, Ian Campbell; Winter, Stephen Benedict David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparation of an arylphosphine of the formula R1OC-Ar-PR2R3 wherein Ar is aryl or heteroaryl; R1 is an alkoxy or amine group; and R2 and R3 are each any organic group; and each of the respective groups may optionally be substituted with any non-interfering group; comprises the reaction of a sulfonyloxy compound of the formula R1OC-Ar-OSO2R4 wherein R4 is alkyl, haloalkyl, perhaloalkyl, aryl, aralkyl or alkaryl with a primary , phosphine of the formula HPR2R3 in a solvent and in the presence of a palladium catalyst and a base. The arylphosphine can then readily be converted to a chiral phosphine ligand.
Read the whole patent
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 30, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 30, 2021.
- 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.