[CH2:1]([O:3][C:4](=[O:14])[CH2:5][P:6](OCC)([O:8][CH2:9][CH3:10])=[O:7])[CH3:2].P(Cl)(Cl)(Cl)(Cl)[Cl:16].C(OC(=O)CP(OCC)(Cl)=O)C>C1C=CC=CC=1>[CH2:1]([O:3][C:4](=[O:14])[CH2:5][PH:6]([O:8][CH2:9][CH2:10][Cl:16])=[O:7])[CH3:2]Ethyl(diethoxyphosphinyl)acetate (11.2 gm., 0.05 mol.) and phosphorus pentachloride (10.5 gm., 0.05 mol.) are dissolved in 200 ml. of benzene and refluxed overnight. The solvent is removed in vacuo, leaving yellow, oily, ethyl(ethoxychlorophosphinyl)acetate as residue (11.5 gm.).
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