Difluorooxymethane derivative and liquid crystal composition

摘要

PCT No. PCT/JP95/02099 Sec. 371 Date Jan. 30, 1997 Sec. 102(e) Date Jan. 30, 1997 PCT Filed Oct. 13, 1995 PCT Pub. No. WO96/11897 PCT Pub. Date Apr. 25, 1996In 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 proposed <IMAGE> (I) +TR <IMAGE> wherein each of l, m, and n is 0 or 1, rings A1 to A3 independently represent six-membered rings such as trans-1,4-cyclohexylene and 1,4-phenylene, Z1 to Z3 independently represent a bonding group such as covalent bond and -CH2CH2-, L1 to L4 independently represent hydrogen atom or halogen atom, and X represents a group such as halogen atom and OCF3. They are useful as liquid crystal materials for low voltages in several modes such as active matrix mode and STN mode.