PROCESS FOR THE PREPARATION OF 11.beta.-HYDROXY-18-ALKYL-ESTRANE COMPOUNDS
CA 1069117 A · Owner: Akzona Incorporated · Inventors: De Jongh, Hendrik P.; Van Bokhoven, Cornelis W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a novel process for the preparation of 11.beta.-hydroxy-18-alkyl-estrene compounds by reacting an 11.beta.-hydroxy-13-methyl-gonane compound with an excess of an acylhypoiodite to give an extrano-18,11.beta.lactone, reacting the latter compound with a Grignard compound or an alkyl lithium compound, possibly after hydrolysis of the lactone, and reducing the thus-obtained 11.beta.-hydroxy-18-alkyl-18-ketone to the corresponding 11.beta.hydroxy-18-alkyl-estrane compound, and to novel intermediates of the subject compounds.
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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 January 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 1, 1997.
- 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.