| abstract |
A compound represented by the formula (1). n n nwherein Ra is alkyl having 1 to 10 carbon(s) and, in that alkyl, any of —CH 2 — may be replaced with —O—, —S—, —CO—, —CH═CH— or —C≡C— or any of hydrogens may be replaced with halogen or —CN; A 1 , A 2 and A 3 are independently 1,4-cycolohexylene, 1,4-cyclohexenylene, 1,4-phenylene, naphthalene-2,6-diyl, n n1,2,3,4-tetrahydronaphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl or 1,4-bicyclo[2.2.2]octylene and, in such a ring, any —CH 2 — may be replaced with —O—, any —CH═ may be replaced with —N═ and any hydrogen may be replaced with halogen; Z 1 , Z 2 and Z 3 are independently a single bond, —(CH 2 ) 2 —, —(CF 2 ) 2 —, —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —CH═CH—, —CF═CF—, —C≡C—, —(CH 2 ) 4 —, —(CH 2 ) 3 O— or —O(CH 2 ) 3 —; p and q are independently 0 or 1. nAlso provided is a liquid crystal composition containing the same and a liquid crystal display element containing the composition. |