Preparation of sulphonated aromatic esters

Details Preparation of sulphonated aromatic esters Preparation of sulphonated aromatic esters

C - Chemistry, Metallurgy

07

C

260/489, 260/466

C07C 309/42 (2006.01)

Patent

CA 1290764

C -060 (2) 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: (1) preparing the unsulphonated aromatic ester; (2) sulphonating said unsulphonated aromatic ester; and (3) neutralising 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 neutralise the sulphonic acid group(s) and any free or complexed SO3 present in the product mixture from the sulphonation reaction. Preferred neutralising agent is sodium acetate; preferred solvents are acetic acid or glyme and di- glyme.

525928

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