Process for producing fluorinated aromatics and fluorinated nitrogen-containing hetero-aromatics
CA 2248294 A1 · Owner: Kleiner, Hans-Jerg · Inventors: Appel, Wolfgang; Pasenok, Sergej; Kleiner, Hans-Jerg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The production of fluorinated aromatic compounds of general formula (I) in , which W, X, Z, R1 and R2 have the meanings given in the description from , corresponding C1 or Br-containing compounds with fluorides e.g. KF, with , halogen exchange in a reaction medium is known. According to the invention, the "halex" reaction (exchange of a halogen for fluorine) is performed in a reaction medium containing compounds of general formula (III) (IV) and/or (V) , in which R16 to R24 have the meaning given in the description. This provides a particularly advantageous process in which gentler conditions may be applied while providing higher output and fewer by-products. Fluorinated aromatic …
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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 28, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 2019.
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Timeline
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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.