Preparation of 5-hydroxymethylimidazoles
CA 1134839 A · Owner: Basf Aktiengesellschaft · Inventors: Frank, Anton; Karn, Helmut; Kempe, Uwe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is concerned with a process for the preparation of a 5-hydroxymethylimidazole of the formula 1 1, where R1 is hydrogen or alkyl of 1 to 18 carbon atoms phenyl, benzyl or .beta.-phenylethyl, and R2 is alkyl of 1 to 18 carbon atoms or phenyl, wherein an imdazole of the formula 2 2, where R1 and R2 have the meanings given for formula 1 is reacted, with formaldehyde or an oligomer of formaldehyde is aqueous hydrochloric acid solution, containing from 5 to 18% by weight of hydrogen chloride, at from 80° to 160°C if appropriate in a, closed system under pressure the resulting 5hydroxymethylimida-, zole is isolated in the form of its hydrochloride and the ratio of imidazole to …
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
- Granted November 2, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 1999.
- 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.