| 摘要 |
The invention provides a process for the preparation of compounds of the formula (1) in which A is C<subscript>2</highlight>- to C<subscript>4</highlight>-alkylene, B is C<subscript>1</highlight>- to C<subscript>4</highlight>-alkylene n is a number from 1 to 100, and R is C<subscript>1</highlight>- to C<subscript>30</highlight>-alkyl, C<subscript>2</highlight>- to C<subscript>30</highlight>-alkenyl, or C<subscript>6</highlight>- to C<subscript>30</highlight>-aryl, by alkylating a basic mixture of oxethylated alcohols of the formula and alkoxides thereof with a C<subscript>2</highlight>- to C<subscript>5</highlight>-chlorocarboxylic acid, and purifying the basic intermediate obtained in this way, following acidification, by washing with aqueous sulfate solution until the ether carboxylic acid obtained in this way has a conductivity of <1000 muS/cm.
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