Process for making 1-(3-benzyloxyphenyl)-1,1- dimethylheptane and intermediates therefor
CA 1198450 A · Owner: Pfizer Limited · Inventors: Melvin, Lawrence S. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PROCESS FOR MAKING 1-(3-BENZYLOXYPHENYL)- 1,1-DIMETHYLHEPTANE AND INTERMEDIATES THEREFOR Abstract, Process for making 1-(3-benzyloxyphenyl)-1,1-dimethylheptane, a valuable intermediate for the preparation of analgesic agents, which comprises benzylation of 3-hydroxyacetophenone to produce 3-benzyloxyacetophenone which is converted to 1-(3-benzyloxyphenyl)-1methylheptan-1-ol via Grignard reaction with n-hexylmagnesium bromide; chlorination of said heptanol by reaction with hydrogen chloride followed by methylation of the thus-produced 1-(3-benzyloxyphenyl)-1-chloro-1methylheptane with trimethylaluminum.
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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 December 24, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 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.