Process for the preparation of phenylmalonic acid dinitriles
CA 2503558 C · Owner: Syngenta Participations Ag · Inventors: Zeller, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of a compound of formula I (see formula I), by reaction of a compound of formula II (see formula II), with malonic acid dinitrile in an inert diluent in the presence of a palladium catalyst , and a base, wherein the base is a hydroxide of an alkali metal or a mixture of hydroxides of alkali metals;, and wherein the palladium catalyst is a palladium(II) dihalide palladium(II) , acetate, palladium(II) sulfate bis(triphenylphosphine)palladium(II) , dichloride bis(tricyclopentylphosphine)palladium(II) dichloride bis(tricyclohexylphosphine)palladium(II) dichloride bis(dibenzylideneacetone)palladium(0) or tetrakis(triphenylphosphine)palladium(0). The compound of …
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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 December 4, 2003 and granted July 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 4, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2025.
- 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
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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.