Process for the production of chloropyridines substituted by methyl, trichloromethyl or trifluoromethyl groups
US4469896A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1983 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Jul 8, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C47/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Chloropyridines of the formula ##STR1## wherein either R is chlorine and R' is methyl or trifluoromethyl, or R is methyl, trichloromethyl or trifluoromethyl and R' is chlorine, or R and R' are methyl, can be obtained by a novel, simple process by the addition of trichloroacetaldehyde to methacrylonitrile or .alpha.-trifluoromethacrylonitrile, 2,2-dichloropropionaldehyde, pentachloropropionaldehyde or 2,2-dichloro-3,3,3-trifluoropropionaldehyde to acrylonitrile, or 2,2-dichloropropionaldehyde to methacrylonitrile, in the presence of a catalyst, in particular copper powder or copper(I) chloride, and cyclizing the open-chain intermediate obtained. The chloropyridines of the formula (I) are known per se and are suitable for the production of different compounds, in particular of insecticides and herbicides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.