Preparation of alkenols
CA 2083653 A1 · Owner: Klein, Ulrich · Inventors: Buschmann, Ernst; Klein, Ulrich; Mackenroth, Christiane
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/42925, Abstract of the disclosure: A process for preparing alkenols of the formula I, R1-CH=CH(CH2)nOH I where R1 is hydrogen or a hydrocarbon radical and n is an, integer from 3 to 15, a) by reacting a phosphonium salt of the formula IIa R1-CH2-P+(C6H5)3X- IIa, where X is chlorine bromine or iodine, with an, aldehyde of the formula IIIa or its hemiacetal of the formula IIIb, , IIIa IIIb, or, b) by reacting a phosphonium salt of the formula IIb (C6H5)3P+(CH2)n+1OH X- IIb, with a aldehyde of the formula IV R1CHO IV, in a solvent in the presence of a base wherein the, base is the alkali metal salt of an alcohol and the solvent is an alcohol.
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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 November 24, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 24, 2014.
- 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.