| abstract |
New liquid-crystalline ester compounds which exhibit a liquid-crystalline phase within a broad temperature range and have a positive, dielectric anisotropy, and a liquid-crystalline composition comprising the same are provided which ester compounds are expressed by the general formula <IMAGE> (I) wherein R represents hydrogen atom or an alkyl group of 1 to 10 carbon atoms; <IMAGE> each represent <IMAGE> X represents <IMAGE> Y represents hydrogen atom, F, Cl or CN; and Z represents F, Cl or CN. |