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:
Mar. 17, 1998
Filed:
Nov. 14, 1996
Krishnamurthy Nacharaju, Holland, MI (US);
James J Springer, Saugatuck, MI (US);
Wyckoff Chemical Company, Inc., South Haven, MI (US);
Abstract
A process for preparing 4-aryl-1,2,4-triazol-3-ones and 4-aryl-5-alkoxy-1,2,4-triazol-3-ones. A reaction mixture includes a primary aromatic amine, an alkyl carbazate and a trialkyl orthoformate. The reactants are heated in a reaction vessel in the presence of an acid catalyst and a polar solvent. After the reaction is complete, the solvent is removed, water is added, and the slurry is filtered to isolate 4-aryl-5-alkoxy-1,2,4-triazol-3-one. Alternatively, after the reaction is complete, an alkali metal alkoxide is added to the reaction mixture in the vessel, and the new mixture is again heated until the reaction is complete. The solvent is distilled from the mixture, and the remaining mixture is diluted with water. The slurry is separated from mixture, washed and dried to obtain 4-aryl-1,2,4-triazol-3-one in near 100% yield.