Process for the preparation of methyl 5-bromo-6-methoxy-1- naphthoate
CA 2124767 A1 · Owner: Cassella Aktiengesellschaft · Inventors: Wessel, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of methyl 5-bromo-6methoxy-1-naphthoate by brominating methyl 6-methoxy-1-naphthoate with bromine is disclosed. In the process between 0.5 and 0.6, mol of bromine (Br2) are employed per mole of methyl 6-methoxy-1naphthoate and the bromination is carried out in the presence of an oxidant which is capable of oxidizing hydrogen bromide to give bromine, such as manganese dioxide cerium (IV) salts, alkali metal bromates or peroxy compounds. The reaction is preferably carried out in a solvent which is miscible with water such as lower aliphatic carboxylic acids or lower aliphatic alcohols. The process according to the invention is characterized by a high yield and …
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
- Filed May 31, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2016.
- 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.