US 4,788,316 A · Preparation of sulphonated aromatic esters

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) 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.

Claims13

Dependent claims

A process for preparing substituted or unsubstituted sulphonato-phenyl carbonates having the general formula:

##STR3## werein R is a C.sub.1 -C.sub.18 normal alkoxyl radical;
X.sub.1 -X.sub.4 may be hydrogens, or one or more may be halogens, C.sub.1 -C.sub.4 alkyl or alkoxyl radicals, RCOO- wherein R is defined as above, or SO.sub.3 M;
and M is an alkali metal, earth alkali metal or ammonium group, comprising the steps of:
(1) preparing the corresponding unsulphonated phenyl carbonate ester;
(2) sulphonating said unsulphonated phenyl carbonate ester to form a sulphonic acid derivative;
and
(3) neutralising said sulphonic acid derivative of phenyl carbonate ester in a non-aqueous organic solvent with an alkali meal, earth alkali metal or ammonium carboxylate in an amount in excess over the amount needed to neutralise the sulphonic acid groups and any free or complexed SO.sub.3 present in the product mixture from the sulphonation reaction.

4 more elements

Dependencies are inferred from the claim text.

Preparation of sulphonated aromatic esters

Life of this patent

Preparation of sulphonated aromatic esters

Life of this patent

Abstract

Claims13