Sulfur trioxide sulfonation of aromatic chloroformates
US4985561A · kind A · utility
3Cited by
4References
21Claims
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Key dates
| Filing date | Aug 29, 1989 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Aug 29, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/393
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is described for obtaining sulfophenyl quaternary ammonium or phosphonium substituted carbonic acid esters. These esters are prepared through sulfonation with sulfur trioxide of aromatic chloroformates followed by reaction of the sulfonated aromatic chloroformate with quaternary ammonium or phosphonium substituted alcohols. The resultant sulfophenyl esters are useful as bleach precursors in combination with peroxygen compounds such as sodium perborate or percarbonate.
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