TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): The ester-group containing compound of formula (II) reacts with an oxidizing agent, to obtain alicyclic epoxy compound (I). Preferred Process: A hydroxyl-group containing compound of formula (III) and carboxylic acid-containing compound of formula: Ra-C(=O)-OH (IV) or its derivatives are reacted, to obtain ester-group containing compound (II). Preferred Definitions:    R1-R11=H.    SPECIFIC COMPOUNDS - 59 Alicyclic epoxy compounds (I) are disclosed, e.g. 7-oxabicycloheptan-3-ylmethyl-3,5,5-trimethylhexanoate of formula (Ia), 7-oxabicycloheptan-3-ylmethyl-2,2,3-trimethylhexanoate, 7-oxabicycloheptan-3-ylmethyl-2,2,4-trimethylhexanoate, 7-oxabicycloheptan-3-ylmethyl-2,2,5-trimethylhexanoate and 7-oxabicycloheptan-3-ylmethyl-2,3,3-trimethylhexanoate.    EXAMPLE - 300 g 3-Cyclohexene-1-methanol, 352.6 g 3,5,5-trimethylhexanoic acid and 0.7 g p-toluene sulfonic acid were stirred at 120 degrees C and reacted for 12 hours, to obtain reaction solution. The unreacted raw material from the reaction solution was removed by heating at 150 degrees C under reduced pressure of 10 Torr for 3 hours, and the reaction solution was cooled to room temperature. 562.4 g Ethyl acetate, 1124.9 g distilled water and 0.1 g sodium hydroxide were added to the obtained reaction solution, stirred for 30 minutes, and subjected to alkaline cleaning. After alkaline cleaning the aqueous layer was extracted and removed after separating the organic layer and aqueous layer. The organic layer was washed with water by adding 1124.9 g distilled water, stirred for 30 minutes, and desolvation of the collected organic layer was performed at 120 degrees C, to obtain 511 g cyclohexenyl methyl-3,5,5-3-trimethyl hexanoate. 484.6 g Cyclohexenyl methyl-3,5,5-3-trimethyl hexanoate and 969.1 g ethyl acetate were stirred at 30 degrees C, and 554.8 ethyl acetate solution of 30 wt.% paracetic acid was dripped for 2 hours and further stirred for 5 hours. 2008.4 g Distilled water was added to the obtained solution after the reaction, aqueous layer was withdrawn and removed after organic and aqueous layers were separated, and desolvation of organic layer was performed at 150 degrees c under reduced pressure of 10 Torr, to obtain 7-oxabicycloheptan-3-ylmethyl-3,5,5-trimethylhexanoate having epoxy equivalent of 276.3.