Process for the production of 3-hydroxy-1,2,4-triazole derivatives
US4055572A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1976 |
| Grant date | Oct 25, 1977 |
| Priority date | — |
| Expiry date | Jul 20, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D249/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the production of 3-hydroxy-1,2,4-triazole derivatives of formula I ##STR1## wherein R.sub.1 and R.sub.2 each represent a straight-chain or branched-chain alkyl group having 1 to 6 carbon atoms, or a cycloalkyl group having 3 to 6 carbon atoms, and PA1 X represents oxygen or sulphur, Which process comprises adding to a 1-alkyl-1-cyanohydrazine of formula II ##STR2## wherein R.sub.1 has the meaning given under formula I, a compound of formula III EQU r.sub.2 -- xh (iii) PA1 wherein R.sub.2 and X have the meanings given under formula I; and subsequently cyclising the addition product by reaction with a compound of formula IV ##STR3## wherein R.sub.3 and R.sub.4 independently of one another represent chlorine or an alkoxy group having 1 to 4 carbon atoms. The 3-hydroxy-1,2,4-triazole derivatives are valuable intermediates for producing phosphoric acid esters which can be used as pesticidal agents, particularly as insecticides and nematicides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.