Processes for purifying ligands
US11124531B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2018 |
| Grant date | Sep 21, 2021 |
| Priority date | — |
| Expiry date | Jun 12, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/025
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Embodiments of the present invention are directed to processes for purifying ligands such as organopolyphosphite ligands. In one embodiment, a process comprises: (a) receiving a solid organopolyphosphite compound that has been recrystallized or triturated at least once, wherein the solid organopolyphosphite compound comprises greater than one weight percent of an oxidized phosphite impurity and wherein the organopolyphosphite compound is substantially free of solvent; (b) slurrying the solid organopolyphosphite compound in a C2 or higher alcohol at a temperature of at least 60° C. for at least 20 minutes to reduce the oxidized phosphite impurity in the solid phase; and (c) removing liquid comprising dissolved oxidized phosphite impurity from the slurry, wherein the residual oxidized phosphite impurity content of the organopolyphosphite compound following step (c) is 1 weight percent or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.