Preparation of 6a,10a-trans-hexahydrodibenzopyranones
CA 1188702 A · Owner: Icn Canada Limited · Inventors: Ryan, Charles W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Reaction of an O-methyl or O-ethyl resorcinol with a cyclohexene carbinol derivative in the presence of a catalyst affords a 6a,10a-trans-1-methoxy or 1-ethoxy-6,6-dimethyl-6,6a,7,8,10,10a-hexahydro-9Hdibenzob,dpyran-9-one derivative. Optional deesterification of the product affords the corresponding 1-hydroxy compound.
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 June 11, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 11, 2002.
- 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.