Patent ID: 7226644

Claim:
A compound represented by general formula (1): (wherein R 1 and R 2 each independently represents hydrogen, an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms, in which one CH 2 group or at least two CH 2 groups that are not adjacent to each other may be substituted by oxygen or sulfur, or in which at least one hydrogen may be substituted by fluorine or chlorine, A 1 , A 2 , A 3 , and A 4 each independently represents a trans-1, 4-cyclohexylene group (in which one CH 2 group or two CH 2 groups that are not adjacent to each other may be substituted by oxygen or sulfur), a 1,4-phenylene group (in which at least one CH group may be substituted by nitrogen), a 1,4-cyclohexenylene group, a 1,4-bicyclo[2,2.2]octylene group, a piperidine-1,4-diyl group, a naphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group or a l,2,3,4-tetrahydronaphthalene-2,6-diyl group, in which hydrogen may be substituted by —CN or halogen, Z 1 , Z 2 , Z 3 , and Z 4 each independently represents —CH 2 CH 2 —, —CH═CH—, —CH(CH 3 )CH 2 —, —CH 2 CH(CH 3 )—, —CH(CH 3 )CH(CH 3 )—, —CF 2 CF 2 —, —CF═CF—, —CH 2 O—, —OCH 2 —, —OCH(CH 3 )—, —CH(CH 3 )O—, —(CH 2 ) 4 —, —(CH 2 ) 3 O—, —O(CH 2 ) 3 , —C≡C—, —CF 2 O—, —OCF 2 —, —COO—, —OCO, —COS, —SCO—, or a single bond, when A 1 , A 2 , A 3 , A 4 , Z 1 , Z 2 , Z 3 , and Z 4 respectively exist in plural, they may be identical to each other or different from each other, a,b,c, and d each independently represents 0 or 1, and W 1 and W 2 each independently represents fluorine, chlorine, —CF 3 , —CF 2 H, —OCF 3 , or —OCF 2 H).