[CH2:1]([P:3]([CH2:6][CH2:7][OH:8])(=[O:5])[OH:4])[CH3:2].[CH2:9]1[O:11][CH2:10]1.[OH-].[K+]>O>[CH2:1]([P:3]([CH2:6][CH2:7][OH:8])(=[O:4])[O:5][CH2:9][CH2:10][OH:11])[CH3:2]A 500 ml five-neck flask equipped with gas inlet tube, thermometer, high-performance stirrer and reflux condenser with gas incineration is charged with 138 g (1 mol) of ethyl(2-hydroxyethyl)phosphinic acid (produced as in Example 8) and ethylene oxide is passed in. A reaction temperature of 70° C. is set, followed by further reaction for 1 h. The ethylene oxide takeup is 64.8 g. The acid number of the product is less than 1 mg KOH/g. 173 g (95% of theory) of 2-hydroxyethyl ethyl(2-hydroxyethyl)phosphinate as colorless, water-clear liquid were obtained.
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