Organic sulfonic acid salts of amino acid esters and process for their preparation
AssigneeBASF SE
InventorsSophia Ebert, Bjoern Ludolph, Dawid Marczewski
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Abstract
The application relates to a process for the synthesis of organic sulfonic acid salts of amino acid esters comprising the steps of (i) reacting at least one lactam with at least 3 carbon atoms in the lactam ring with at least one organic sulfonic acid in an aqueous solution, (ii) esterification of the organic sulfonic amino acid salt of step (i) with at least one alcohol with at least 8 carbon atoms comprising at least one hydroxyl group, (iii) optionally removal of water and/or removal of excess alcohol of step (ii). The application also relates to organic sulfonic acid salts of amino acid esters of the general formula (I).
Claims12
Process for the synthesis of organic sulfonic acid salts of amino acid esters comprising the steps of
- (i) reacting at least one lactam with at least 3 carbon atoms in the lactam ring with at least one organic sulfonic acid in an aqueous solution,
- (ii) esterification of the reaction product of step (i) with at least one alcohol with at least 8 carbon atoms comprising at least one hydroxyl group,
- (iii) optionally removal of water and/or removal of excess alcohol of step (ii);
- wherein the aqueous solution has a molar ratio of water to the at least one lactam of at least 2.33:1.
Process for the synthesis of organic sulfonic acid salts of amino acid esters comprising the steps of
- (i) reacting at least one lactam with at least 3 carbon atoms in the lactam ring with at least one organic sulfonic acid in an aqueous solution,
- (ii) esterification of the reaction product of step (i) with at least one alcohol with at least 8 carbon atoms comprising at least one hydroxyl group,
- (iii) optionally removal of water and/or removal of excess alcohol of step (ii);
- wherein the at least one organic sulfonic acid is not p-toluene sulfonic acid;
- and wherein the aqueous solution has a molar ratio of water to the at least one lactam of at least 2.33:1.
Dependencies are inferred from the claim text.