Process for the production of 2-chloroacetoacetic acid amides
CA 1212960 A · Owner: Lonza Ltd. · Inventors: Tenud, Leander; Miller, Raimund; Jackson, Barry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the production of 2-chloroacetoacetic acid amides. Diketene is converted at a temperature of +30° to -40°C. with the help of hydrogen chloride into acetoacetic acid chloride. Chlorine is introduced into the mixture at a temperature of +30° to -40°C. whereby 2-chloroacetoacetic acid chloride is formed. The latter is converted into the corresponding amide at a temperature of +50° to -40°C. by reaction with a N-compound having the formula:, wherein (i) R = R' = H or, (ii) R = R' = alkyl, substituted alkyl aryl, substituted aryl, alkyl aryl, substituted alkyl aryl alkoxy aryl, substituted alkoxy aryl, alkoxy alkyl or substituted alkoxy alky or, (iii) R = H, and, R'= alkyl, …
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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 October 21, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 21, 2003.
- 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.