Patent ID: 8603359

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2 and ring A 3 are independently 1,4-cyclohexylene, 1,4-phenylene, 1,4-phenylene in which at least one of hydrogen has been replaced by halogen, tetrahydropyran -2,5-diyl, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diyl or pyridine-2,5-diyl; Z 1 , Z 2 and Z 3 are independently a single bond, —(CH 2 )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