| abstract |
High chemical stability, high clearing point, low liquid crystal phase lower limit temperature, low viscosity, large optical anisotropy, large dielectric anisotropy, appropriate elastic constant, excellent compatibility with other liquid crystalline compounds, etc. A liquid crystal compound satisfying at least one of the above physical properties, a liquid crystal composition containing the compound, and a liquid crystal display device containing the composition are provided. The compound represented by Formula (1). In formula (1), for example, R 1 is alkyl having 1 to 15 carbons; ring A 1 , ring A 2 , and ring A 3 are independently 1,4-phenylene, 2-halogeno-1 , 4-phenylene, 2,6-dihalogeno-1,4-phenylene, etc .; Z 1 and Z 2 are independently a single bond or —C≡C—, but at least one is —C≡C L 1 is halogen, —OCF 3 , or —CF 3 ; L 2 , L 3 is independently hydrogen or halogen, but at least one is halogen; m and n are Independently, 0, 1 or 2, and the sum of m and n is 1 or 2. |