| 摘要 |
To provide a liquid crystal compound satisfying at least one of physical properties such as a high stability to heat, light and so forth, a high clearing point, 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 other liquid crystal compounds; a liquid crystal composition containing the compound; and a liquid crystal display device including the composition. The compound is represented by formula (1):;;wherein, for example, Ra and Rb are alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons or alkoxy having 1 to 9 carbons; A1, A2 and A3 are 1,4-cyclohexylene or 1,4-phenylene; Z1 and Z2 are single bonds, —(CH2)2—, —CH═CH—, —COO—, —OCO—, —CF2O—, —OCF2—, —CH2O— or —OCH2—; Y1 is —CF2H or —CF3; Y2 is fluorine; and a, b and d are 0, 1, 2 or 3, and c is 1 or 3. |
| 主权项 |
1. A compound represented by formula (1):wherein, in formula (1),
Ra and Rb are independently hydrogen, halogen or alkyl having 1 to 10 carbons, and in the alkyl, at least one of —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, and at least one of —(CH2)2— may be replaced by —CH═CH— or —C≡C—, and in the groups, at least one of hydrogen may be replaced by fluorine; A1, A2 and A3 are independently 1,4-cyclohexylene, 1,4-phenylene, cyclohexene-1,4-diyl, 2,6,7-trioxabicyclo[2.2.2]octane-1,4-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl or naphthalene-2,6-diyl, and in the groups, one of —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, and at least one of —(CH2)2— may be replaced by —CH═CH— or —CH═N and in the groups, at least one of hydrogen may be replaced by halogen, —C≡N, —CF3, —CHF2, —CH2F, —OCF3, —OCHF2 or —OCH2F; Z1 and Z2 are independently a single bond or alkylene having 1 to 4 carbons, and in the alkylene, at least one of —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, and at least one of —(CH2)2— may be replaced by —CH═CH— or —C≡C—, and in the groups, at least one of hydrogen may be replaced by halogen; Y1 is —CF2H or —CF3, and Y2 is hydrogen, halogen, —CFH2, —CF2H or —CF3; a, b and d are independently 0, 1, 2 or 3, and a sum of a, b and d is 4 or less, and when a, b or d is 2 or more, two of ring A1 selected from two or more of ring A1, two of ring A2 selected from two or more of ring A2, two of ring A3 selected from two or more of ring A3, two of Z1 selected from two or more of Z1, or two of Z2 selected from two or more of Z2 may be identical or different; and c is0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10. |
