Oleum sulfonation of phenyl quaternary alkyl ammonium and phosphonium carbonate esters
US4931563A · kind A · utility
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4References
14Claims
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Key dates
| Filing date | Nov 16, 1988 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Nov 16, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C303/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is provided for obtaining sulfophenyl quarternary ammonium or phosphonium substituted carbonic acid esters. The important step in this process involves reacting a phenyl quaternary ammonium or phosphonium substituted carbonic ester with oleum that contains from 0.5 to 33% sulfur trioxide. Amounts in excess of 33% sulfur trioxide lead to increased reaction times and, eventually, unacceptable product conversons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.