The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 1980
Filed:
Jan. 25, 1979
Applicant:
Inventors:
Hans-Rudolf Mueller, Schaffhausen, CH;
Werner Kuendig, Schaffhausen, CH;
Alfred Hedinger, Thayngen, CH;
Assignee:
Eprova Aktiengesellschaft, Schaffhausen, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548342 ;
Abstract
The yield of 4-methyl-5-hydroxymethyl-imidazole from the known reaction between formaldehyde and 4-methyl-imidazole can be increased greatly if the reaction is performed in a concentrated aqueous medium at pH 11-13.5, preferably 12-13.5, at a temperature of 20.degree.-60.degree. C., preferably 30.degree.-40.degree. C., with an amount of formaldehyde not exceeding 1.5 mole per mole of 4-methyl-imidazole.