| abstract |
In order to provide novel compounds which are useful as liquid crystal materials for low voltages in several liquid crystal displays, have a large dielectric anisotropy, and are low in viscosity; and to improve characteristics of liquid crystal compositions, difluorooxymethane derivatives expressed by the following general formula (I) and liquid crystal compositions containing the compound are proposedn wherein each of ℓ, m, and n is 0 or 1, rings A 1 to A 3 independently represent six-membered rings such as trans-1,4-cyclohexylene and 1,4-phenylene, Z 1 to Z 3 independently represent a bonding group such as covalent bond and -CH 2 CH 2 -, L 1 to L 4 independently represent hydrogen atom or halogen atom, and X represents a group such as halogen atom and OCF3. n They are useful as liquid crystal materials for low voltages in several modes such as active matrix mode and STN mode. |