| 摘要 |
Subject;The subject is to provide a liquid crystal compound satisfying at least one of physical properties such as a high stability to heat or light, a high clearing point (or a high maximum temperature), a low minimum temperature of a liquid crystal phase, a small viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a suitable elastic constant and an excellent compatibility with any other liquid crystal compound, a liquid crystal composition including this compound, and a liquid crystal display device including this composition.;Means for solution;The means concerns a compound represented by formula (1a).;;In formula (1a), R1 is alkyl having 1 to 15 carbons or the like; ring A1, ring A2, ring A3 and ring A4 are independently 1,4-phenylene, naphthalene-2,6-diyl or the like; Z1 and Z2 are independently a single bond or the like; o and p are independently 0, 1 or 2; and n is an integer from 2 to 10. |
| 主权项 |
1. A compound represented by formula (1a):in formula (1a),
R1 is alkyl having 1 to 15 carbons, and in the alkyl at least one —CH2— may be replaced by —O— or —S— and at least one —CH2CH2— may be replaced by —CH═CH—; ring A1, ring A2 and ring A3 are independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, tetrahydropyran-2,5-diyl, 1,3-dioxane-2,5-diyl, 2,6,7-trioxabicyclo[2.2.2]octane-1,4-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, and in these rings at least one hydrogen may be replaced by fluorine or chlorine; ring A4 is 1,4-phenylene or naphthalene-2,6-diyl, and in these rings at least one hydrogen may be replaced by fluorine or chlorine; Z1 and Z2 are independently a single bond, —CH2CH2—, —CH═CH—, —C≡C—, —COO—, —OCO—, —CH2O—, —OCH2—, —CF2O—, —OCF2— or —CF═CF—; o and p are independently 0, 1 or 2, and the sum of o and p is 0, 1 or 2; and n is an integer from 2 to 10. |
