[CH2:1]([O:3][CH:4]([O:14][CH2:15][CH3:16])[CH2:5][P:6]([O:11][CH2:12][CH3:13])([O:8][CH2:9][CH3:10])=[O:7])C.[Br:17]CC(O)CO.CC1C=CC(S(O)(=O)=O)=CC=1.C(=O)(O)[O-].[Na+]>C1(C)C=CC=CC=1>[Br:17][CH2:16][C@@H:15]1[CH2:1][O:3][C@@H:4]([CH2:5][P:6]([O:8][CH2:9][CH3:10])([O:11][CH2:12][CH3:13])=[O:7])[O:14]1To a solution of diethylphosphonoacetaldehyde diethylacetal (15.00 g, 59.0 mmol) and 3-bromo-1,2-propanediol (11.00 g, 71.0 mmol, 1.2 eq.) in toluene (60 mL) was added pTSA (few cristals). The mixture was stirred at reflux for 72 hr and was cooled to room temperature. A saturated solution of sodium bicarbonate was added and the aqueous phase was extracted with dichloromethane. The organic phase was dried over anhydrous sodium sulphate and evaporated under reduced pressure. The crude material was pure by TLC and NMR and gave 17.93 g of the compound in a 96% yield.
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