[O:1]([CH:8]([OH:10])[CH3:9])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[OH:11][PH:12]([OH:14])=[O:13].O>C1(C)C(C)=CC=CC=1>[P:12]([O:10][CH:8]([O:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)[CH3:9])([OH:14])([OH:13])=[O:11]1 mol of phenoxyethanol is esterified azeotropically in the presence of 1.1 mol of H3PO3 in xylene on a water separator. The reaction product which precipitates on cooling is filtered off, washed with petroleum ether and dried to give a white powder. The amount of the phosphoric diester (2-phenoxyethanol hydrogensulphate, 0-50%) which may be formed in this reaction in addition to phenoxyethanol phosphate (phenoxyethanol dihydrogenphosphate) does not interfere in the polycondensation which subsequently takes place; it is also incorporated into the polycondensate.
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