TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): Compound (I, II or III) is obtained by reacting (meth)acrylate compound having hydroxyl group (e.g. propylene oxide glyceryl dimethacrylate, glyceryl dimethacrylate) with a compound (e.g. diphenylacetyl chloride, 2-naphthoyl chloride) containing substituent (e.g. halo or alkoxy) which reacts with hydroxyl group and has detachment ability, in the presence of a base (e.g. sodium hydroxide, t-butoxy potassium).    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: 0.1-5 Parts mass of polymerization initiator is contained with respect to 100 parts mass of aromatic-group-containing (meth)acrylate compound, urethane oligomer, and reactive monomer. The curable composition has a viscosity of 10-10000 mPa.second at 25 degrees C. Preferred Property: The cured material has a refractive index of 1.55-1.65. SPECIFIC COMPOUNDS - 1-Isobutyryloxymethyl-2-(2-methyl-acryloyloxy)-ethyl naphthalene-1-carboxylate of formula (IA) and 1-isobutyryloxymethyl-2-(2-methyl-acryloyloxy)-ethyl biphenyl-4-carboxylate are disclosed as compound (I, II or III).    EXAMPLE - (In parts mass) toluene (300), glyceryl dimethacrylate (96), and triethylamine (43) were stirred in a reaction container. 1-Naphthoyl chloride (80) was dripped and stirred at room temperature. Pure water was added to the reaction liquid and reaction was completed. The reaction mixture was then extracted using ethyl acetate, and the ethyl-acetate phase was washed twice with saturated salt solution, dried, and concentrated under reduced pressure to obtain 1-isobutyryloxymethyl-2-(2-methyl-acryloyloxy)-ethyl naphthalene-1-carboxylate of formula (IA). A curable composition was prepared by mixing Lucirin TPO-L (RTM: ethyl(2,4,6-trimethylbenzoyl)phenylphosphinate) (1) and the obtained compound (100). The composition had a viscosity of 458 mPa.second. The cured material of the composition had a refractive index of 1.5847 at 589 nm, a total light transmittance of 92%, a glass transition temperature of 150 degrees C, and a pencil hardness of 5H as measured by JIS-K5600.