Transesterification route to quaternary ammonium substituted carbonate esters
US5175333A · kind A · utility
5Cited by
5References
14Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 29, 1992 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Jan 29, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/393
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is reported for preparation of quaternary ammonium type carbonate esters which are useful as bleach precursors in detergent compositions. The process involves transesterification of low molecular weight carbonates, e.g. diphenyl carbonate, with amino functionalized alcohols, e.g. dialkylaminoalkanol. Preferably the reaction involves transesterification of diphenylcarbonate with the hydroxyl compound followed by removal of phenol. Subsequent thereto the transesterified ester is quaternized with an alkylating agent. Optionally there may be a sulfonation of phenol ester subsequent to the quaternization reaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.