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:
Jun. 15, 1999
Filed:
Dec. 11, 1998
Vijay C Desai, Shawnee, KS (US);
Klaus Jelich, Overland Park, KS (US);
Hans Joachim Diehr, Wuppertal, DE;
Reinhard Lantzsch, Wuppertal, DE;
Bayer Corporation, Pittsburgh, PA (US);
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
The present invention is related to an improved process for the commercial preparation of substituted aminotriazolinones, which are known intermediates in the preparation of herbicidal active compounds. In particular, this invention relates to the preparation of 4-amino-1,2,4-triazolin-5-ones, and more particularly to the preparation of 3-isopropyl-4-aminotriazolinone. The process of the invention includes reacting an oxadiazolinone with hydrazine hydrate in the absence of a solvent. In a preferred embodiment, the hydrazine hydrate is mixed with a basic compound, preferably aqueous sodium hydroxide.