[O:1]=[C:2]([P:6](=[O:11])([O:9]C)[O:7][CH3:8])[CH2:3][CH2:4][CH3:5].[I-].[Na+:13]>CC(CC)=O>[O:1]=[C:2]([P:6](=[O:9])([O-:11])[O:7][CH3:8])[CH2:3][CH2:4][CH3:5].[Na+:13]Dimethyl (1-oxobutyl)phosphonate (10.8 g, 0.06 mol) and sodium iodide (9.0 g, 0.06 mol) were dissolved in ethyl methyl ketone (160 ml) and the solution stirred and refluxed for 16 hours.
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