C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 249/12 (2006.01) C07D 249/14 (2006.01)
Patent
CA 2291508
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.
Desai Vijay C.
Diehr Hans-Joachim
Jelich Klaus
Lantzsch Reinhard
Aktiengesellschaft Bayer
Corporation Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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