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A 8 liter, 4 necked flask equipped with a thermometer, cooling jacket, stirring means and drip funnel was charged with 200 g of cyclohexen-4-ylmethyl methacrylate produced in Step A and 1200 ml of methylene chloride. The reactants were cooled to a temperature below 10° C. A solution of 268.6 g of m-chloroperbenzoic acid (80% purity, Kishida Chemicals) in 2800 ml of methylene chloride was added thereto dropwise over 3 hours and then allowed to react for additional 3 hours with stirring. After the reaction, an amount of 10% aqueous solution of sodium sulfite was added to the reaction mixture and allowed to react at room temperature for 1 hour to decompose unreacted perbenzoate. After having confirmed the absence of perbenzoate using starch-iodine indicator paper, the reaction mixture was washed with 1000 ml of an aqueous solution containing 81 g of sodium carbonate and then with an amount of saline successively. Thereafter the mixture was dried over magnesium sulfate and evaporated under reduced pressure with addition of 40 mg of p-methoxyquinone as a polymerization inhibitor to remove the solvent. 206 g of crude product of the titled compound was obtained. Yield: 95% of theory.

1. customA 8 liter, 4 necked flask equipped with a thermometer
2. temperaturecooling jacket
3. temperatureThe reactants were cooled to a temperature below 10° C
4. customto react for additional 3 hours
5. stirringwith stirring
6. customAfter the reaction
7. customto react at room temperature for 1 hour
8. washthe reaction mixture was washed with 1000 ml of an aqueous solution
9. additioncontaining 81 g of sodium carbonate
10. dry with materialThereafter the mixture was dried over magnesium sulfate
11. customevaporated under reduced pressure with addition of 40 mg of p-methoxyquinone as a polymerization inhibitor
12. customto remove the solvent