Patent ID: 6844032

Claim:
A liquid crystal compound represented by formula (1): Ra—A 1 —Z 1  m —A 2 —Z 2  n —A 3 —Z 3 —A 4 —Rb (1) wherein Ra and Rb independently are alkyl having 1 to 20 carbons, any —CH 2 — in the alkyl may be replaced by —O—, —S—, —CH═CH—, or —C≡C—, and any hydrogen may be replaced by halogen; A 1 , A 2 , A 3 , and A 4 independently are 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,3-dioxane-2,5-diyl, 1,4-phenylene, pyridine-2,5-idiyl, pyrimidine-2,5-diyl, pyridazine-3,6-diyl, or 2,3-bis(trifluoromethyl)-1,4-phenylene, any hydrogen in these rings may be replaced by halogen, and at least one of A 1 , A 2 , A 3 , and A 4 is 2,3-bis(trifluoromethyl)-1,4-phenylene; Z 1 , Z 2 and Z 3 independently are 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 —; m and n independently are 0 or 1.