| 主权项 |
1. A compound represented by formula (1): wherein, in formula (1),
R1 is alkyl having 1 to 15 carbons, in the alkyl, at least one of —CH2— may be replaced by —O— or —S—, at least one of —(CH2)2— may be replaced by —CH═CH—, and in the groups, at least one of hydrogen may be replaced by halogen;ring A1, ring A2, ring A3 and ring A4 are independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene, 2-chloro-1,4-phenylene, 2,6-dichloro-1,4-phenylene, 2-chloro-6-fluoro-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 or pyridine-2,5-diyl;X1 is halogen, —C≡N, —N═C═S, alkyl having 1 to 10 carbons in which at least one of hydrogen is replaced by fluorine, alkenyl having 2 to 10 carbons in which at least one of hydrogen is replaced by fluorine, alkoxy having 1 to 9 carbons in which at least one of hydrogen is replaced by fluorine, or alkenyloxy having 2 to 9 carbons in which at least one of hydrogen is replaced by fluorine;L1 and L2 are independently hydrogen or fluorine;Y1 and Y2 are independently fluorine or chlorine;W1 is a single bond, —(CH2)2—, —CH═CH—, —C≡C—, —COO—, —OCO—, —CH2O—, —OCH2— or —CF═CF—;Z1, Z2, Z3 and Z4 are independently a single bond, —(CH2)2—, —CH═CH—, —C≡C—, —COO—, —OCO—, —CF2O—, —CH2O—, —OCH2— or —CF═CF—;a, b, c and d are independently 0 or 1, a sum of a, b, c and d is 1, 2 or 3; andat least one of Z1 when a is 1, Z2 when b is 1, Z3 when c is 1, and Z4 when d is 1 is —CF2O—. |
