Polymerizable compound and liquid crystal composition

1. A compound represented by general formula (i),

(in the formula, R i1 represents a hydrogen atom, a linear or branched alkyl group having 1 to 40 carbon atoms, an alkyl halide group, or P i1 -Sp i1 -, in which —CH 2 — in the alkyl group in the linear or branched alkyl group or the alkyl halide group may be substituted by —CH═CH—,—C≡C—, —O—, —NH—, —COO—, or —OCO— so that oxygen atoms are not directly adjacent to each other; A i1 represents a divalent 6-membered aromatic cyclic group, a divalent 6-membered aromatic heterocyclic group, a divalent 6-membered aliphatic cyclic group, or a divalent 6-membered aliphatic heterocyclic group, in which a hydrogen atom in a cyclic structure of A i1 may be substituted by a halogen atom, P i1 -Sp i1 -, a monovalent organic group having a substituent represented by K i1 , or R i1 ; Z i1 represents a single bond, —CH═CH—, —CF═CF—, —C≡C—, —COO—, —OCO—, —OCOO—, —OOCO—, —CF 2 O—, —OCF 2 —, —CH═CHCOO—, —OCOCH═CH—, —CH═C(CH 3 )COO—, —OCOC(CH 3 )═CH—, —CH 2 —CH(CH 3 )COO—, —OCOCH(CH 3 )—CH 2 —, —OCH 2 CH 2 O—, or an alkylene group having 2 to 20 carbon atoms, in which one or two or more nonadjacent —CH 2 — may be substituted by —O—, —COO—, or —OCO—; K i1 represents a group represented by general formulae (K-1) to (K-3); X K1 and Y K1 each independently represent —CH 2 —, an oxygen atom, or a sulfur atom; Z K1 represents an oxygen atom or a sulfur atom; S 1 , S 3 , S 4 , and S 5 each represent an alkylene group having 1 to 6 carbon atoms or a single bond; S 2 represents C, or Si; X 1 and X 2 each represent OH, —NH 2 , —NHR i1 , —CHO, —COOH, or —SH; P and P i1 each represent a polymerizable group; Sp i1 represents a spacer group or a single bond; m i1 represents an integer of 2 to 4; n represents 1; when a plurality of each of R i1 , A i1 , Z i1 , K i1 , X K1 , Y K1 , Z K1 , S 1 , S 2 , S 3 , S 4 , S 5 , p i1 , Sp i1 , and n are present in the general formula (i), they may be the same or different)

2. The compound according to claim 1 , wherein in the general formula (i), A i1 represents a group having a cyclic structure selected from a 1,4-phenylene group, a 1,4-cyclohexylene group, an anthracene-2,6-diyl group, a phenanthrene-2,7-diyl group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a naphthalene-2,6-diyl group, an indane-2,5-diyl group, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and a 1,3-dioxane-2,5-diyl group, in which the cyclic structure may be unsubstituted or substituted by an alkyl group having 1 to 12 carbon atoms, an alkyl halide group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an alkoxy halide group having 1 to 12 carbon atoms, a halogen atom, or P i1 -Sp i1 -.

3. The compound according to claim 1 , wherein P i1 -Sp i1 -represents a substituent selected from the group represented by general formula (P-1) to general formula (P-14) below,

(in the formulae, a black spot at the right end represents a bond).

4. The compound according to claim 1 , wherein in the general formula (i), K i1 represents (K-1),

5. The compound according to claim 4 , wherein S 4 and S 5 each represent the alkylene group having 1 to 6 carbon atoms, and X i and X 2 each represent —OH.

6. The compound according to claim 1 , wherein in the general formula (i), K i1 represents (K-2):

7. The compound according to claim 1 , wherein in the general formula (i), K i1 represents (K-1),

wherein a hydrogen atom in a cyclic structure of at least one A i1 is substituted by P i1 -Sp i1 -.

8. A liquid crystal composition comprising the compound according to claim 1 , a polymerizable compound, and a nonpolymerizable liquid crystal composition.

9. The liquid crystal composition according to claim 8 , comprising, as the polymerizable compound, one or two or more compounds represented by general formula (P),

(in the formula,

Z p1 represents a fluorine atom, a cyano group, a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, in which a hydrogen atom may be substituted by a halogen atom, an alkoxy group having 1 to 15 carbon atoms, in which a hydrogen atom may be substituted by a halogen atom, an alkenyl group having 1 to 15 carbon atoms, in which a hydrogen atom may be substituted by a halogen atom, an alkenyloxy group having 1 to 15 carbon atoms, in which a hydrogen atom may be substituted by a halogen atom, or -Sp p2 —R p2

R p1 and R p2 each represent any one of the following formula (R-I) to formula (R-VIII):

(in the formulae,

* represents a bond to Sp p1 or Sp p2

R 2 to R 6 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or an alkyl halide group having 1 to 5 carbon atoms;

W represents a single bond, —O—, or a methylene group;

T represents a single bond or —COO—; and

p, t, and q each independently represent 0, 1, or 2);

Sp p1 and Sp p2 each represent a spacer group;

L p1 and L p2 each independently represent a single bond,

—O—, —S—, —CH 2 —, —OCH 2 —, —CH 2 O—, —CO—, —C 2 H 4 —, —COO—, —OCO—, —OCOOCH 2 —, —CH 2 OCOO—, —OCH 2 CH 2 O—, —CO—NR a —, —NR a —CO—, —SCH 2 —, —CH 2 S—, —CH═CR a —COO—, —CH═CR a —OCO—, —COO—CR a ═CH—, —OCO—CR a ═CH—, —COO—CR a ═CH—COO—, —COO—CR a ═CH—OCO—, —OCO—CR a ═CH—COO—, —OCO—CR a ═CH—OCO—, —(CH 2 )z-C(═O)—O—, —(CH 2 )z-O—(C═O)—, —O—(C═O)—(CH 2 )z-, —(C═O)—O—(CH 2 )z-, —CH 2 (CH 3 )C—C(═O)—O—, —CH 2 (CH 3 )C—O—(C═O)—, —O—(C═O)—C(CH 3 )CH 2 , —(C═O)—O—C(CH 3 )—CH 2 , —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —CF 2 —, —CF 2 O—, —OCF 2 —, —CF 2 CH 2 —, —CH 2 CF 2 —, —CF 2 CF 2 —, or —C≡C— (wherein R a each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and z represents an integer of 1 to 4);

Mp 2 represents a 1,4-phenylene group, a 1,4-cyclohexylene group, an anthracene-2,6-diyl group, a phenanthrene-2,7-diyl group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a naphthalene-2,6-diyl group, an indane-2,5-diyl group, a 1,2,3,4-tetrehydronaphthalene-2,6-diyl group, a 1,3-dioxane-2,5-diyl group, or a single bond, and Mp 2 is may be unsubstituted or substituted by an alkyl group having 1 to 12 carbon atoms, an alkyl halide group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an alkoxy halide group having 1 to 12 carbon atoms, a halogen atom, a cyano group, a nitro group, or —R p1 ;

M p1 represents any one of the following formulae (i-11) to (ix-11):

(in the formulae, * represents a bond to Sp p1 , and ** represents a bond to L P1 , L p2 , or Z p1 );

MP 3 represents any one of the following formulae (i-13) to (ix-13):

(in the formulae, * represents a bond to Z p1 , and ** represents a bond to L p2 );

m p2 to m p4 each independently represent 0, 1, 2, or 3;

m p1 and m p5 each independently represent 1, 2, or 3;

when a plurality of Z p1 are present, they may be the same or different; when a plurality of R P1 are present, they may be the same or different; when a plurality of RP 2 are present, they may be the same or different; when a plurality of Sp p i are present, they may be the same or different; when a plurality of Sp p2 are present, they may be the same or different; when a plurality of L P1 are present, they may be the same or different; and when a plurality of MP P2 are present, they may be the same or different).

10. A liquid crystal display device comprising the liquid crystal composition according to claim and two substrates at least one of which does not have an alignment film.