Process for the monosulfonation of aromatic phosphines, and zwitterionic product derived therefrom
US7754924B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2006 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Apr 2, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/5449
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of preparing an aromatic phosphine monosulfonate in zwitterionic form, such as dicyclohexylphenylphosphine monosulfonate zwitterion, involving contacting an aromatic phosphine with a sulfonating agent to provide a reaction mixture containing aromatic phosphine monosulfonate in acid form and unconverted sulfonating agent; quenching or removing substantially all of the unconverted sulfonating agent; partially neutralizing the aromatic phosphine monosulfonate in acid form to phase separate aromatic phosphine monosulfonate in zwitterionic form as a solid or neat liquid layer; and collecting the zwitterion as a solid or neat liquid. The zwitterion may be neutralized to form the corresponding aromatic phosphine monosulfonate metal salt, which is useful in preparing catalysts for hydroformylation processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.