Process for the preparation of 4,5,6-trichloropicolinic acid
US9440923B2 · kind B2 · utility
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13Claims
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Key dates
| Filing date | Aug 5, 2015 |
| Grant date | Sep 13, 2016 |
| Priority date | — |
| Expiry date | Aug 5, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/847
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
4,5,6-Trichloropicolinic acid is prepared by selectively dechlorinating 3,4,5,6-tetrachloropicolinic acid with zinc and a catalyst prepared from a nickel compound and a bidentate ligand in a polar solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.