Process for preparing fluorinated benzyl alcohols and benzaldehydes
CA 2280220 A1 · Owner: Wiedemann, Jurgen · Inventors: Marhold, Albrecht; Wiedemann, Jurgen; Dreisbach, Claus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fluorinated benzaldehydes are obtainable in a simple and inexpensive manner and in significantly improved yields when chlorinated benzaldehydes are reacted with alkali metal fluorides at temperatures in the range from about 130 to 200°C in the presence of less than about 2 mol% of quaternary phosphonium salts based on chlorine atoms to be, replaced at initial concentrations of more than 2.5 mol of the chlorinated benzaldehydes per kg of dipolar aprotic solvent. Fluorinated benzaldehydes obtained in this way can advantageously be hydrogenated with hydrogen in the presence of noble metal catalysts to give fluorinated benzyl alcohols.
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 August 10, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 10, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 10, 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.