Patent ID: 7704409

Claim:
A compound represented by formula (1): wherein R 1 is hydrogen or alkyl having 1 to 20 carbons, in which in the alkyl, arbitrary —CH 2 — may be replaced by —O—, —S—, —COO—, —CH═CH— or —C≡C—, and arbitrary hydrogen may be replaced by halogen or alkyl having 1 to 3 carbons; ring A 1 , ring A 2 , ring A 3 , ring A 4 and ring A 5 are each independently a benzene ring, a piperidine ring, a tetrahydropyrane ring or a dioxane ring, in which in the rings, arbitrary hydrogen may be replaced by halogen, alkyl having 1 to 3 carbons, alkoxy having 1 to 3 carbons or halogenated alkyl having 1 to 3 carbons, and —CH═ may be replaced by —N═; Z 1 , Z 2 , Z 4 , Z 5 and Z 6 are each independently a single bond, —COO— or —CF 2 O— and at least one of Z 1 , Z 2 , Z 3 , Z 4 , Z 5 and Z 6 is —CF 2 O—; Z 3 is a single bond or —CF 2 O—, and in the case where Z 3 is a single bond, ring A 3 is a ring represented by formula (RG-5), or L 1 and L 2 are both fluorine, or at least one of Z 1 , Z 2 , Z 4 , Z 5 and Z 6 is —CF 2 O—; L 1 , L 2 , L 3 and L 4 are each independently hydrogen or halogen; X 1 is hydrogen, halogen, —C≡N, —N═C═S, —C≡C—C≡N, —SF 5 or alkyl having 1 to 10 carbons, in which in the alkyl, arbitrary —CH 2 — may be replaced by —O—, —S—, —CH═CH— or —C≡C—, and arbitrary hydrogen may be replaced by halogen; and l, m, n, o and p are each independently 0 or 1, provided that l+m+n+o+p≦4: