Purification of aryltriazoles
US9518030B2 · kind B2 · utility
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18References
17Claims
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Key dates
| Filing date | Nov 30, 2015 |
| Grant date | Dec 13, 2016 |
| Priority date | — |
| Expiry date | Nov 30, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D249/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Impure aryltriazoles such as benzotriazole and tolyltriazole that are contaminated with dark colored impurities can be purified by conversion to an aryltriazole acid salt by treatment with aqueous acid. The aryltriazole acid salt is water soluble whereas the dark colored impurities are not. The aryltriazole acid salt solution is separated from the dark colored impurities and the aryltriazole acid salt is isolated by precipitation. The free aryltriazole may be recovered by neutralization with base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.