13.alpha.-ALKYLGONAN-DELTA _____-5,10-EPOXIDES
CA 1289135 C · Owner: Neef, Gunter · Inventors: Vierhufe, Harry; Neef, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
13alpha-alkylgonan-delta9(11)-5,10 expoxides of the formula, in which, R is hydrogen, methyl or ethyl and Z is a ketal or thioketal group effective as a keto-blocking group, are provided by a process wherein a compound of the formula, in which R and Z are as defined above is irradiated with, active ultraviolet radiation. They are useful as intermediates in the production of 11-beta-aryl-substituted 13-alpha-alkylgonans in good yields and in high purity.
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
- Granted September 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2008.
- 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.