Liquid crystal compound, liquid crystal composition and liquid crystal display device

A compound represented by formula (1-1):

• wherein, in formula (1-1),
• R is hydrogen or alkyl having 1 to 10 carbons, and 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 and ring A3 are independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 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, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, 1,4-phenylene, or 1,4-phenylene in which at least one of hydrogen is replaced by halogen;
• W1 is a group represented by formula (1a) or formula (1b);
• wherein, in formula (1a) and formula (1b),
• Y1 and Y2 are independently hydrogen, chlorine or fluorine, Y3, Y4 and Y5 are independently hydrogen, fluorine or chlorine, and at least two of Y3, Y4 and Y5 is fluorine or chlorine;
• and
• in formula (1-1),
• W2 is a group represented by formula (1c) or formula (1d);
• wherein, in formula (1c) and formula (1d),
• L1, L2, L3, L4 and L5 are independently hydrogen, fluorine or chlorine;
• and
• in formula (1-1),
• X is halogen, —C≡N, —N═C═S, —SF5, —CF3, —CF2H, —CFH2, —OCF3, —OCF2H, —OCFH2 or alkyl having 1 to 10 carbons, and in the alkyl, at least one of —CH2— may be replaced by —O— or —S—, at least one of —(CH2)2— may be replace by CH═CH—, and in the groups, at least one of hydrogen may be replaced by halogen;
• and
• l, m and n are 0 or 1, and a sum of l, m and n is 0, 1 or 2;
• in which, when a sum of l and m is 1 and n is 0, at least one of W1 and W2 is a group represented by formula (1b) or formula (1d), or at least one of l piece of ring A1 and m pieces of ring A2 is 1,4-cyclohexylene, 1,4-cyclohexenylene, 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, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, or 1,4-phenylene in which at least one of hydrogen is replaced by halogen.