Method for the preparation of 1,3-disubstituted 4,5- cis-dicarboxy-2-imidazolidones
CA 1180338 A · Owner: Basf Aktiengesellschaft · Inventors: Vogel, Friedrich; Trautmann, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
IMPROVED METHOD FOR THE PREPARATION OF 1,3-DISUBSTITUTED 4,5-CIS-DICARBOXY-2-IMIDAZOLIDONES Abstract of the Disclosure, A process for the preparation 1,3-disubstituted 4,5-cis-dicarboxy-2-imidazolidones useful as intermediates in the preparation of Vitamin H (biotin) said intermediates, have the general formula in which R is an aliphatic hydrocarbon radical having 1 to 8 carbon atoms, an aralkyl radical or an aromatic hydrocarbon radical, preferably an allyl radical or a benzyl radical comprising reacting a defined diaminosuccinic acid with phosgene in the presence of an alkali metal hydroxide.
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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 2, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 2002.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.