[C:1]([OH:5])(=[O:4])[CH:2]=[CH2:3].S(=O)(=O)(O)O.[CH2:11]=[C:12]1[CH:19]2[CH2:20][CH:15]3[CH2:16][CH:17]([CH2:21][CH:13]1[CH2:14]3)[CH2:18]2.[OH-].[Na+]>C1(C)C=CC=CC=1>[C:1]([O:5][C:12]1([CH3:11])[CH:13]2[CH2:21][CH:17]3[CH2:16][CH:15]([CH2:20][CH:19]1[CH2:18]3)[CH2:14]2)(=[O:4])[CH:2]=[CH2:3]A 500 ml flask was flushed with nitrogen to displace the air with nitrogen, and was charged with 36.0 g (0.50 mol) of acrylic acid, 0.5g (5mmol) of sulfuric acid and 100 g of toluene. Separately 88.8 g (0.60 mol) of 2-methyleneadamantane, prepared by the same procedures as described in Reference Example 1, was dissolved in 100 g of toluene. The obtained solution of 2-methyleneadamantane in toluene was dropwise added to the content in the flask over a period of about 3 hours, while the content was maintained at a reaction temperature of about 20° C. Then the content was stirred for 5 hours at the same temperature. After completion of the reaction, the residual catalyst was neutralized by adding 40.0 g (50 mmol) of a 5% aqueous sodium hydroxide solution, and the neutralized liquid was washed with an aqueous saturated sodium chloride solution. The thus-obtained organic phase was subjected to column chromatography, and further, analyzed by NMR and mass spectrometry. Thus, 100.7 g (yield: 91.5%) of the object 2-methyl-2-adamantyl acrylate was obtained.
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