Process for preparing 4-amino-1,2,4-triazolin-5-ones

Details Process for preparing 4-amino-1,2,4-triazolin-5-ones Process for preparing 4-amino-1,2,4-triazolin-5-ones

1998-12-11

1999-06-15

Morris, Patricia L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D24912

Patent

active

059123540

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.

REFERENCES:
patent: 4952701 (1990-08-01), Muller et al.
patent: 5693821 (1997-12-01), Diehr et al.

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