Patent ID: 8273420

Claim:
A liquid crystal compound represented by the following formula (1): R 1 -(A 1 ) a -Z 1 -(A 2 ) b -Z 2 -(A 7 ) e -Z 5 -A 3 -CF═CFCF 2 O-A 4 -Z 3 -(A 5 ) c -Z 4 -(A 6 ) d -R 2 (1) wherein R 1 and R 2 independently represent hydrogen atom, a halogen atom, —CN, —NCS, —SF 5 , or an alkyl group containing 1 to 18 carbon atoms, wherein at least one hydrogen atom in the group is optionally substituted with fluorine atom, at least one —CH 2 — in the group is optionally substituted with ethereal oxygen atom or thioethereal sulfur atom, and at least one —CH 2 CH 2 — in the group is optionally substituted with —CH═CH— or —C≡C—, A 1 , A 2 , A 3 , A 4 , A 5 , A 6 and A 7 independently represent trans-1,4-cyclohexylene group, 1,4-cyclohexenylene group, 1,3-cyclobutylene group, 1,2-cyclopropylene group, naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group, or 1,4-phenylene group, wherein at least one hydrogen atom in the group is optionally substituted with a halogen atom, one or two ═CH— in the group is optionally substituted with nitrogen atom, and one or two —CH 2 — in the group is optionally substituted with ethereal oxygen atom or thioethereal sulfur atom, Z 1 , Z 2 , Z 3 , Z 4 , and Z 5 independently represent single bond, an alkylene group containing 1 to 4 carbon atoms wherein at least one hydrogen atom in the group is optionally substituted with fluorine atom, and at least one —CH 2 — in the group is optionally substituted with ethereal oxygen atom or thioethereal sulfur atom, and at least one —CH 2 CH 2 — in the group is optionally substituted with —CH═CH— or —C≡C—, and a, b, c, d, and e independently represent 0 or 1 with the proviso that 0≦a+b+c+d+e≦3.