Patent · US Expired

Preparation of 4-amino-1,2,4-triazol-5-ones

US5153326A · kind A · utility

1Cited by

1References

6Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Klaus Konig · Leverkusen, DE
Klaus-Helmut Muller · Düsseldorf, DE
Lothar Rohe

Key dates

Filing date	Apr 23, 1991
Grant date	Oct 6, 1992
Priority date	—
Expiry date	Apr 23, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D249/12
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the preparation of 4-amino-1,2,4-triazol-5-one of the formula ##STR1## in which 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 EQU R--C.tbd.N (III) The carbodihydrazide of the formula (II) may be produced in a preliminary stage by reacting a carbonic acid derivative with hydrazine or hydrazine hydrate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.