Liquid crystalline compound having negative permittivity anisotropy with fluorobiphenyl, liquid crystal composition and liquid crystal display element

摘要

To provide a liquid crystalline compound exhibiting high stability against heat or light, high clearing point (or high upper limit temperature), low lower limit temperature of a liquid crystal phase, low viscosity, appropriate optical anisotropy, negative large dielectric constant anisotropy, appropriate elastic modulus, and excellent compatibility with other liquid crystalline compounds at a room temperature or a low temperature, and to provide a liquid crystal composition containing the compound and a liquid crystal display element containing the composition.SOLUTION: There is provided a compound represented by the formula (1). Ris alkyl having 2 to 10 carbon atoms, in which one -CHCH- is substituted by -CH=CH-, or the like; Ris alkyl having 1 to 8 carbon atoms, a ring Ais 1,4-cyclohexylene or the like, Yand Yare hydrogen, fluorine or the like, Zis a single bond or the like; nis 1 or 2.SELECTED DRAWING: None