O.[P:2]([Cl:6])(Cl)([Cl:4])=[O:3].[CH2:7]([OH:12])[CH2:8][CH2:9][CH2:10][CH3:11]>C(Cl)(Cl)(Cl)Cl>[P:2]([Cl:6])([Cl:4])(=[O:3])[O:12][CH2:7][CH2:8][CH2:9][CH2:10][CH3:11]To a tap water cooled solution of 79 g of phosphorous oxychloride in 200 ml of carbon tetrachloride is added dropwise with stirring a solution of 50 g of 1-pentanol in 125 ml of carbon tetrachloride. The temperature rises to 30° C. and stirring is continued for 18 hours. The solvent is evaporated and the syrup evaporated with toluene several times. The residue is distilled from a Kugelrohr still to give 108.7 g of the desired product as a colorless oil, B.P. 85°-90° C./0.3 mm.
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