| abstract |
The invention provides a liquid crystal compound having general physical properties necessary for the compound, namely stability to heat, light and so forth, a wide temperature range of a liquid crystal phase, a high clearing point, a good compatibility with other compounds, a large optical anisotropy and a large dielectric anisotropy; a compound represented by formula (1): wherein, for example, R1 is alkyl having 1 to 20 carbons; ring A1 and ring A4 each are 1,4-cyclohexylene, 1,4-phenylene, or 1,4-phenylene in which arbitrary hydrogen is replaced by halogen; Z1 and Z4 each are a single bond; L1, L2, L3 and L4 each are hydrogen or fluorine; and X1 is fluorine, chlorine, —CF3 or —OCF3. |