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US 4,057,546 AGranted
4-Amino-1,2,4-triazin-5-ones
AssigneeBayer Aktiengesellschaft
InventorsHelmut Timmler, Wilfried Draber
Life of this patent
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Abstract
Novel glyoxylic acid hydrazide-2-acylhydrazones of the formula: ##STR1## in which R.sup.1 is hydrogen or alkyl, and R.sup.2 is alkyl or optionally substituted phenyl And are prepared by reacting the corresponding glyoxylic acid ester 2-acylhydrazone with hydrazine hydrate. The compounds (I) are useful in preparing herbicidally active 4-amino-1,2,4-triazine-5-one compounds.
Claims7
Process for the preparation of a 4-amino-1,2,4-triazin-5-one compound of the formula:
- ##STR52## which process comprises heating a glyoxylic acid hydrazide-2-acylhydrazone compound of the formula ##STR53## wherein R.sup.1 is hydrogen or alkyl, and
- R.sup.2 is alkyl, phenyl or substituted phenyl
- in the presence of a polar organic solvent at a temperature of 60.degree. to 150.degree. C.
Dependencies are inferred from the claim text.