Process for preparing a basic thioether and the salts thereof
CA 1268474 C · Owner: Lazar, Arpad · Inventors: Diesler, Eszter; Lazar, Arpad; Stefko, Bela
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the acid addition salts of 2- (2-aminoethyl)-thiomethyl-5-dimethylamino-methylfuran of the formula (I) and a process for preparing same and if desired, for, transforming any of the new salts obtained to the known base of formula (I). The process comprises a) reacting the zwitterionic (5-dimethylaminomethyl-2-furylmethyl) hydrogen sulphate of formula (III) with cysteamine or with an acid addition salt thereof, or b) treating 5-dimethylaminomethyl-2-furfuryl alcohol of the formula (IV) with sulphur trioxide or an agent suitable to introduce sulphur trioxide in the presence of a solvent then, separating and reacting the obtained (5-dimethylaminomethyl-2furylmethyl) …
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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 May 1, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 1, 2007.
- 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
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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.