Method for preparing 1,1′-ethylene-2,2′-bipyridinium dichloride
US10858337B2 · kind B2 · utility
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Key dates
| Filing date | Oct 13, 2017 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Oct 13, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D471/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for preparing 1,1′-ethylene-2,2′-bipyridinium dichloride includes mixing an aqueous diquat dibromide solution with hydrochloric acid, adding dropwise to a mixture of an organic solvent, a bromine absorbent, and an oxidant, and reacting to produce 1,1′-ethylene-2,2′-bipyridinium dichloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.