| abstract |
High stability to heat and light, high clearing point (or high maximum temperature), low minimum temperature of liquid crystal phase, small viscosity, large optical anisotropy, negative large dielectric anisotropy, appropriate elastic constant A liquid crystal compound satisfying at least one of physical properties such as good compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition are provided. A compound represented by formula (1). (R 1 and R 2 are each independently C1-15 alkyl, H, etc .; A 1 to A 4 are each independently 1,4-cyclohexylene, 1,4-phenylene, etc .; Z 1 to Z 4 are each independently Y 1 to Y 3 are each independently F, Cl or CHF 2 ; a, b, c and d are each independently 0 or 1; 0 ≦ a + b + c + d ≦ 3) [Selection figure] None |