Methods of purifying 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole
US6469175B1 · kind B1 · utility
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Key dates
| Filing date | Feb 20, 2001 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Feb 20, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D285/125
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Methods of purifying 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole include the steps of providing a first 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole composition comprising 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole and organic solvent; performing a first extraction of the 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole composition with a first inorganic acid solution; and performing a second extraction of the 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole composition with a second inorganic acid solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.