Tetrahydropyran compound, liquid crystal, composition and liquid crystal display device containing the liquid crystal composition

A compound represented by the following formula (1):

• wherein
• R1 and R2 are independently hydrogen or alkyl having from 1 to 10 carbons, provided that in the alkyl arbitrary —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, and arbitrary —(CH2)2— may be replaced by —CH═CH— or —C≡C—;
• T1, T2 and T3 are independently tetrahydropyran-2,5-diyl or tetrahydropyran-3,6-diyl;
• A1 and A2 are independently 1,4-cyclohexylene, 1,4-phenylene, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl or naphthalene-2,6-diyl, provided that in these rings one of —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, and arbitrary —(CH2)2— may be replaced by —CH═CH—, and in the 1,4-phenylene one of —CH=may be replaced by —N═;
• Z1, Z2, Z3 and Z4 are independently a single bond or alkylene having from 1 to 4 carbons,
• provided that in the alkylene arbitrary —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, and arbitrary —(CH2)2— may be replaced by —CH═CH— or —C≡C—;
• i is 0 or 1;
• j, k and m are independently 0, 1 or 2;
• n is 0 or 1;
• i+j+k+m+n is 2, 3 or 4;
• and
• i+k+n is 1, 2, 3 or 4, wherein
• when i is 0, j is 1 or 2;
• when n is 0, m is 1 or 2, and Z4 is a single bond;
• when i is 1, R1 is alkyl having from 1 to 10 carbons, provided that in the alkyl arbitrary —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, and arbitrary —(CH2)2— may be replaced by —CH═CH— or —C≡C—;
• when i+k+n is 1, T1, T2 and T3 are independently tetrahydropyran-2,5-diyl;
• when i+j+k+m+n is 2, j, k and m are independently 0 or 1, and A1 and A2 are independently 1,4-cyclohexylene or decahydronaphthalene-2,6-diyl, provided that in these rings one of —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—;
• when i+j+k+m+n is 3, j, k and m are independently 0 or 1, and at least one of A1 and A2 is 1,4-cyclohexylene or decahydronaphthalene-2,6-diyl, provided that in these rings one of —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, wherein when i+j+k+m+n is 3, i+k is 0, A1 is 1,4-cyclohexylene and A2 is 1,4-phenylene, at least one of R1 and R2 is alkenyl;
• and
• when i+j+k+m+n is 4, at least two of A1 and A2 each is 1,4-cyclohexylene or decahydronaphthalene-2,6-diyl, provided that in these rings one of —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, wherein when i+j+k+m+n is 4, j+m is 3 and n is 1, j is 1.