Preparation of 4-cyano-4'-hydroxy biphenyl
CA 2280955 A1 · Owner: Cazaux, Jean-Bernard · Inventors: Cazaux, Jean-Bernard; Le Breton, Christine
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for preparing 4-cyano-4'-hydroxy biphenyl consisting in protecting the aldehyde function of 4-bromo-benzaldehyde reacting the protected 4-bromo-benzaldehyde with p-alcoxyphenyl magnesium halide deprotecting the formyl of the protected 4-alcoxy-4'-formyl-biphenyl and transforming the formyl group into cyano and hydrolysing the alcoxy group of the resulting 4-alcoxy-4'-cyano biphenyl.
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 February 16, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2020.
- 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.