Patent ID: 8372975

Claim:
A compound represented by formula (1): wherein, in formula (1), R 1 is alkyl having 1 to 20 carbons, and in the alkyl, arbitrary —CH 2 — may be replaced by —O—, —S— or —CH═CH—; ring A 1 and ring A 4 are independently 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl, tetrahydropyran-2,5-diyl, 1,4-phenylene, or 1,4-phenylene in which arbitrary hydrogen is replaced by halogen; Z 1 and Z 4 are independently a single bond, —CH 2 CH 2 —, —CH═CH—, —C≡C—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 O—, —OCH 2 —, —CF═CF—, —(CH 2 ) 4 —, —(CH 2 ) 2 CF 2 O—, —(CH 2 ) 2 OCF 2 —, —CF 2 —O—(CH 2 ) 2 —, —CF 2 (CH 2 ) 2 —, —CH═CH— (CH 2 ) 2 — or —(CH 2 ) 2 —CH═CH—; L 1 , L 2 , L 3 and L 4 are independently hydrogen, fluorine or chlorine; X 1 is hydrogen, halogen, —C≡N, —N═C═S, —SF 5 or alkyl having 1 to 10 carbons, and in the alkyl, arbitrary —CH 2 — may be replaced by —O—, —S— or —CH═CH—, and arbitrary hydrogen may be replaced by halogen; 1 and o are independently an integer from 0 to 3, and a sum of 1 and o is 3 or less; and when 1 is 1, o is 0, ring A 1 is 1,4-phenylene and X 1 is fluorine, at least one of L 1 , L 2 , L 3 and L 4 is hydrogen.