Method for making bicyclic lactones
CA 1308111 C · Owner: Korte, Stephan · Inventors: Coulston, Craig; Korte, Stephan; Korte, Friedhelm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for making a bicyclic lactone comprising heating under aqueous acidic conditions a beta, gamma unsaturated cyclic nitrile of the formula wherein R3, R4, R5, and R6 are independently selected from the group consisting of -H -CH3; R2 is, selected from the group consisting of -H -CH3, and, -C2H5: R8 is -H or -CH3; m is an integer from 1 to 5; o is 0, 1, 2, or 3 and p is 0, 1, or 2; provided that the sum m + o + p is an integer from 3 to 5; and an aldehyde having the formula, wherein R1 is selected from the group consisting of -H and -CH3, for a length of time sufficient to convert at least a portion of the reactants to a bicyclic lactone of the formula, wherein R1,R2 R4, R5, R6, m, o, …
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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
- Granted September 29, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 2009.
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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.