| 摘要 |
PROBLEM TO BE SOLVED: To obtain a liquid crystal compound having low viscosity, negative dielectric anisotropy and excellent optical anisotropy, voltage-retention, stability and compatibility and useful for liquid crystal display element, etc., by introducing a specific group into a skeleton structure. SOLUTION: The compound has a group of C(CF3 )2 G and/or GC(CF3 )2 [G is O, a (1-10C alkyl-substituted)imino, etc.] in the skeleton structure and is expressed by the formula [R<1> and Y<1> are each a 1-20C alkyl, H, a halogen cyano, etc.; X<1> to X<4> are each (CH2 )2 , CH=CH, C≡C, COO, C(CF3 )2 G, etc.; the rings A<1> to A<5> are each trans-cyclohexane-1,4-diyl, cyclohex-1-ene-1,4-diyl, 1,4-phenylene, etc.; a<1> to a<5> are each 0 or 1; a<1> +a<2> +a<3> +a<4> +a<5> >=1].
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