Preparation of sulphonated aromatic esters
US4788316A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1986 |
| Grant date | Nov 29, 1988 |
| Priority date | — |
| Expiry date | Dec 16, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C309/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing sulphonated aromatic esters of the group consisting of substituted or unsubstituted sulphonato-phenyl carboxylates and sulphonato-phenyl carbonates is disclosed, comprising the steps of: PA1 (1) preparing the unsulphonated aromatic ester; PA1 (2) sulphonating said unsulphonated aromatic ester; and PA1 (3) neutralizing the acid-sulphonated aromatic ester in a non-aqueous organic solvent with an alkali metal, earth alkali metal or ammonium carboxylate in an amount in excess over the amount needed to neutralize the sulphonic acid group(s) and any free or complexed SO.sub.3 present in the product mixture from the sulphonation reaction. Preferred neutralizing agent is sodium acetate; preferred solvents are acetic acid or glyme and diglyme.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.