Compound having polymerizable group, liquid crystal composition and liquid crystal display device

A compound, represented by formula (1):

• wherein, in formula (1),
• R1 is alkyl having 1 to 15 carbons, and in the alkyl, at least one piece of —CH2— may be replaced by —O— or —S—, and at least one piece of —(CH2)2— may be replaced by CH═CH—, and in the groups, at least one piece of hydrogen may be replaced by halogen;
• ring A1, ring A4 and ring A5 are independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 2,3,4-tetrahydronaphthalene-2,6-diyl, tetrahydropyran-2,5-diyl, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diyl or pyridine-2,5-diyl, and in the rings, at least one piece of hydrogen may be replaced by halogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkyl having 1 to 12 carbons in which at least one piece of hydrogen is replaced by halogen;
• Z1 and Z5 are independently a single bond or alkylene having 1 to 10 carbons, and in the alkylene, at least one piece of —CH2— may be replaced by —O—, —COO—, —OCO— or —OCOO—, and at least one piece of —(CH2)2— may be replaced by CH═CH— or and in the groups, at least one piece of hydrogen may be replaced by fluorine or chlorine;
• Sp1, Sp2 and Sp3 are independently a single bond or alkylene having 1 to 10 carbons, and in the alkylene, at least one piece of —CH2— may be replaced by —O—, —COO—, —OCO— or —OCOO—, and at least one piece of —(CH2)2— may be replaced by —CH═CH— or —C≡C—, and in the groups, at least one piece of hydrogen may be replaced by fluorine or chlorine;
• P1, P2 and P3 are independently a polymerizable group represented by formula (P-1) to formula (P-5);
• wherein, in formula (P-1) to formula (P-5),
• M1, M2 and M3 are independently hydrogen, fluorine, alkyl having 1 to 5 carbons, or alkyl having 1 to 5 carbons in which at least one piece of hydrogen is replaced by halogen;
• and
• in formula (1), R2 is a group represented by formula (1a), formula (1b) or formula (1c):
• wherein, in formula (1a), formula (1b) and formula (1c),
• Sp4 and Sp5 are independently a single bond or alkylene having 1 to 10 carbons, and in the alkylene, at least one piece of —CH2— may be replaced by —O—, —NH—, —CO—, —COO—, —OCO— or —OCOO—, and at least one piece of —(CH2)2— may be replaced by —CH═CH— or —C≡C—, and in the groups, at least one piece of hydrogen may be replaced by fluorine or chlorine;
• S1 is >CH— or >N—;
• S2 is >C< or >Si<;
• X1 is a group represented by —OH, —NH2, —OR3, —N(R3)2, —COOH, —SH, —B(OH)2 or —Si(R3)3, in which R3 is hydrogen or alkyl having 1 to 10 carbons, and in the alkyl, at least one piece of —CH2— may be replaced by —O—, and at least one piece of —(CH2)2— may be replaced by —CH═CH—, and in the groups, at least one piece of hydrogen may be replaced by fluorine or chlorine;
• and
• in formula (1),
• a and b are independently 0, 1, 2, 3 or 4, and a sum of a and b is 0, 1, 2, 3 or 4;
• d is 1, 2, 3 or 4;
• and
• c and e are independently 0, 1, 2, 3 or 4.