Process for preparing nematicidal benzoxazole and benzthiazole compounds
US5451681A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1994 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Dec 29, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D277/74
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing a compound of formula (I) ##STR1## wherein X is oxygen or sulphur, by (a) reacting a substituted ortho-nitro or -nitroso phenol or a substituted ortho-nitro or -nitroso thiophenol with an alkali metal dithionite reducing agent in an alkaline reaction medium in the presence of carbon disulphide, to form a substituted 2-mercaptobenz-oxazole or -thiazole, acidifying the reaction mixture and collecting the 2-mercaptobenz-oxazole or -thiazole; and then (b) reacting the 2-mercaptobenz-oxazole or -thiazole with a compound of formula (IV) EQU CF.sub.2 .dbd.CH--CH.sub.2 --CH.sub.2 --L (IV) wherein L is a good leaving group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.