TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): The diolefin compound is obtained by reacting a cyclohexenecarboxylic acid derivative and 1,1-cycloalkane dimethanol.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The epoxy resin is obtained by epoxidizing using hydrogen peroxide or peroxy acid. EXAMPLE - (In parts weight) toluene (150), (1-(hydroxymethyl)cyclohexyl)methanol (72), 3-cyclohexenecarboxylic acid (126), and p-toluenesulfonic acid (2) were reacted and heat-refluxed for 10 hours, with water removal. The product was washed thrice with water and 10 wt.% sodium hydrogen carbonate aqueous solution (50). The organic layer was washed with water (50). The organic solvent was concentrated, to obtain (1-((cyclohex-3-en-1-ylcarbonyloxy)methyl)cyclohexyl)methyl cyclohex-3-ene-1-carboxylate (176) with a purity of greater than 98 area%. Water (15), 12-tungstophosphoric acid (0.95), disodium hydrogen phosphate (0.78), and Arquad 2HT (RTM: di-hydrogenated-tallow alkyl dimethyl ammonium acetate) (2.7) were mixed, and the obtained compound (90) in toluene (120) was added to obtain an emulsion. The solution was stirred at 50 degrees C. 35 Wt.% hydrogen peroxide solution (55) was added and stirred at 50 degrees C for 13 hours. The reaction mixture was neutralized with 1 wt.% sodium hydroxide aqueous solution. 20 Wt.% sodium thiosulfate aqueous solution (25) was added and stirred for 30 minutes, and the product was left still. The organic layer was separated. Wakogel C-300 (RTM: silica gel) (10), CAP SUPER (RTM: activated carbon) (20), and Bengel SH (RTM: bentonite) (20) were added and filtered after stirring for 1 hour at room temperature. The obtained filtrate was washed thrice with water (100), and the organic layer was separated to obtain epoxy resin (92) of formula (II) with a purity of 93%. The epoxy resin had an epoxy equivalent of 202 g/eq. The cured material of a composition containing the epoxy resin (20.2), Rikacid MH700G (RTM: methyl hexahydrophthalic anhydride) (16.8), and hexadecyltrimethylammonium hydroxide (0.08) had a glass transition temperature of 189 degrees C.