[CH2:1]([C:3]1([CH2:10][O:11][C:12](=[O:16])[C:13]([CH3:15])=[CH2:14])[CH2:8][O:7][C:6](=[O:9])[O:5][CH2:4]1)[CH3:2].[CH3:17][OH:18].C1(C)C=CC(S(O)(=O)=O)=CC=1>ClCCCl>[CH2:1]([C:3]([CH2:10][O:11][C:12](=[O:16])[C:13]([CH3:15])=[CH2:14])([CH2:8][O:7][C:6]([O:5][CH3:4])=[O:9])[CH2:17][OH:18])[CH3:2]11.4 g of 5-ethyl-5-methacryloyloxymethyl-2-oxo-1,3-dioxane, 3.2 g of methanol and 0.285 g of p-toluenesulfonic acid were dissolved in 100 g of 1,2-dichloroethane. The solution was stirred for 2 hours at 40° C. and evaporated in vacuo to remove the solvent. After removing white precipitates by filtration, the residue was further concentrated whereupon the title compound was recovered as a colorless oil.
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