Liquid crystal compound having benzopyran skeleton, liquid crystal composition, and liquid crystal display device

A liquid crystal composition, containing at least one compound represented by formula (1) as component (a):

• wherein, in formula (1),
• R1 and R2 are independently hydrogen, alkyl having 1 to 16 carbons, alkenyl having 2 to 16 carbons, cyclopropyl, cyclobutyl or cyclopentyl, and in the alkyl and the alkenyl, at least one —CH2—is optionally replaced by —O—, —S—, —CO—, —COO—, —OCO—, —OCOO—, —C≡C—, cyclopropane-1,2-diyl or —Si(CH3)2—, and in the groups, at least one hydrogen is optionally replaced by fluorine or chlorine, and in the groups, at least one —CH3 is optionally replaced by any one of monovalent groups (G1) to (G4) below;
• wherein, in groups (G1) to (G4),
• R3 is alkyl having 1 to 12 carbons or alkenyl having 2 to 12 carbons, and in the alkyl and the alkenyl, at least one —CH2 — is optionally replaced by —O—, and in the groups, at least one hydrogen is optionally replaced by fluorine or chlorine;
• and
• in formula (1),
• ring A1 and ring A2 are independently 1 ,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, decahydronaphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl or naphthalene-2,6-diyl, and in the groups, one or two pieces of —CH2 — is optionally replaced by —O—, —S—, —CO—, —CF2—, —SiH2— or —Si(CH3)2—, and one or two pieces of —CH2CH2 — is optionally replaced by —CH═CH— or —CH═N—, and in the groups, at least one hydrogen on an aromatic ring is optionally replaced by halogen, —CF3, —CHF2, —CH2F, —OCF3, —OCHF2, —OCH2F, or —C≡N;
• Z1 and Z2 are independently a single bond or alkylene having 1 to 4 carbons, and one —CH2— is optionally replaced by —O— or —CO—, and at least one —CH2CH2— is optionally replaced by —CH═CH— or —C≡C—, and in the groups, at least one hydrogen is optionally replaced by fluorine or chlorine;
• X, L1 and L2 are independently hydrogen or halogen;
• Y is —CO— or —CF2—;
• and
• a and b are independently 0, 1 or 2.