4-Hydroxybutyl methacrylate → 4-(Phosphonooxy)butyl 2-methylprop-2-enoate

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The same procedures as in Example 4-1 were carried out except for using 4-methacryloyloxybutan-1-ol (47.4 g, 0.30 mole) as a starting material (ester compound) for First Dropping Step of Amine of item (2) of Example 4-1, and the reactions were carried out with the same molar ratios and procedures on and after item (2) of Example 4-1, to give 4-methacryloyloxybutyl dihydrogenphosphate (Compound 1e). The light transmittance and the electric conductivity of the resulting phosphate monomer, and the number of days for gelation of the dental adhesive were evaluated in the same manner as in Example 4-1. The results are summarized in Table 11.

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