| abstract |
A compound represented by formula (1):n nwherein 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-; 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 1, m, n, o and p are each independently 0 or 1, provided that 1+m+n+o+p ≤ 4: |