LIQUID-CRYSTAL ALKENYLTOLAN DERIVATIVE, LIQUID-CRYSTAL COMPOSITION, AND LIQUID-CRYSTAL DISPLAY ELEMENT

摘要

A liquid-crystal alkenyltolan derivative represented by the general formula (1): CtH2t-1-G-(CH2)m-A1-B1-(A2-B2)n-(A3-B3)p-A4-X, wherein A1, A2, A3, and A4 represent each a 1,4-cyclohexylene, 1,4-phenylene or other group; B1, B2, and B3 represent each a covalent bond, 1,2-ethylene, 1,2-ethenylene, 1,2-ethynylene or the like, provided that at least one of B1, B2, and B3 represents a 1,2-ethynylene group; G represents a covalent bond or an oxygen atom; CtH2t-1 represents an alkenyl group having t carbon atoms; n and p are each 0 or 1; and X represents a substitutent such as an alkyl group. This derivative provides a liquid-crystal compound and a liquid-crystal composition which have high anisotropy in permittivity, high elastic constant ratio, excellent compatibility with other liquid-crystal compounds, and low viscosity and are chemically and physicaly stable.