Process for the manufacture of halogenated hydrocarbons
US4285778A · kind A · utility
2Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 1980 |
| Grant date | Aug 25, 1981 |
| Priority date | — |
| Expiry date | May 15, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/25
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
2,2-Dichloro-5-methyl-1,1,1-trifluorohex-4-ene, an intermediate in the synthesis of pyrethroid insecticides, is obtained by continuous distillation, preferably under sub-atmospheric pressure, of a mixture of 5-methyl-2,2,4-trichloro-1,1,1-trifluorohexane, dimethylformamide and lithium bromide, precipitating the chlorofluorocarbons from the distillate with water and separating the desired product from starting material by a further distillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.