Polychloropyridine production from polychloro-2,3-lutidines
US4705859A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1986 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Jul 22, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D213/61
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Polychloropyridines containing chlorine substituents in the 2, 3, and 6 positions and, optionally, in the 4 and 5 positions, are prepared from polychloro-2,3-lutidines containing at least one chlorine substituent in each methyl group and, optionally, a chlorine substituent in the 6 position by liquid phase chlorination. Lewis acid metal halide catalysts are, optionally, employed. 2,3,5,6-Tetrachloropyridine is, accordingly, prepared by chlorination at about 200.degree. to about 260.degree. C. in the presence of ferric chloride catalyst of a mixture of polychloro-2,3-lutidines obtained by the vapor phase chlorination of 2,3-lutidine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.