Purification of aryltriazoles
US9242942B2 · kind B2 · utility
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18References
24Claims
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Key dates
| Filing date | Jul 1, 2013 |
| Grant date | Jan 26, 2016 |
| Priority date | — |
| Expiry date | Jul 1, 2033 |
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 imputities 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 is recovered by neutralization with base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.