Cl.[CH2:2]([O:6][P:7]([O-:13])[O:8][CH2:9][CH2:10][CH2:11][CH3:12])[CH2:3][CH2:4][CH3:5].[CH2:14]([C:18]([CH3:20])=[O:19])[CH:15]([CH3:17])[CH3:16]>C(N(CC)CC)C.[Cl-].[Mg+2].[Cl-]>[CH2:9]([O:8][P:7]([C:18]([OH:19])([CH3:20])[CH2:14][CH:15]([CH3:17])[CH3:16])(=[O:13])[O:6][CH2:2][CH2:3][CH2:4][CH3:5])[CH2:10][CH2:11][CH3:12]Into a two-liter four-necked flask provided with a stirrer, a thermometer, dropping device, a hydrochloric-acid-recovering device and a condenser, 213.4 g (1.1 moles) of dibutylphosphite, 5.6 g (0.06 moles) of triethylamine and 1.05 g (0.011 moles) of magnesium chloride were fed. While stirring the resulting mixed solution at 25° C., 120.0 g (1.2 moles) of methyl isobutyl ketone (MIBK) was added thereto in 1 hour. The resulting mixed solution was further stirred for 1 hour at the same temperature (25° C.) to complete the reaction. Thereafter, the mixed solution was washed to remove the low-boiling point portions, as in (synthesis of raw material 2) of Example 1, and thus, the triethylamine and the magnesium chloride was removed from the mixed solution, to obtain 298.8 g of dibutyl(1-hydroxy-1,3-dimethylbutyl)phosphonate (raw material 3).
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