Preparation of 4-amino-1,2,4-triazol-5-ones
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United States of America Patent
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Jul 23, 1991
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N/A
app pub date -
Jun 6, 1990
filing date -
Jun 21, 1989
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Expired
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Abstract
A process for the preparation of 4-amino-1,2,4-triazol-5-one of the formula ##STR1## in which p0 R represents unsubstituted or substituted alkyl, alkenyl, cycloalkenyl, cycloalkyl, aralkyl, aryl or heterocyclyl, which comprises reacting a carbodihydrazide of the formula ##STR2## with a nitrile of the formula R--C.tbd.N (II) The carbodihydrazide of the formula (II) may be produced in a preliminary stage by reacting a carbonic acid derivative with hydrazine or hydrazine hydrate.
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