Patent ID: 7357964

Claim:
A compound of formula (1): wherein R 1 represents halogen, —CN, —CF 3 , —CF 2 H, —CFH 2 , —OCF 3 , —OCF 2 H, —N═C═O, —N═C═S, or alkyl having from 1 to 20 carbon atoms, and any —CH 2 — of the alkyl may be substituted with —O—, —S—, —CO—, —COO—, —OCO—, —CH═CH—, —CF═CF— or —C≡C—, and any hydrogen thereof may be substituted with halogen or —CN; R 2 , R 3 and R 5 each independently represent hydrogen or alkyl having from 1 to 3 carbon atoms; A 1 , A 2 , A 3 and A 4 each independently represent 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, naphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl, fluorene-2,7-diyl, bicyclo[2.2.2]octane-1,4-diyl or bicyclo[3.1.0]hexane-3,6-diyl, and in these rings, any —CH 2 — may be substituted with —O—, and any —CH═ may be substituted with —N═, and in these rings, any hydrogen may be substituted with halogen or alkyl having from 1 to 5 carbon atoms; Z 1 , Z 2 and Z 3 each independently represent a single bond, —(CH 2 ) a —, —O(CH 2 ) a —, —(CH 2 ) a O—, —O(CH 2 ) a O—, —CH═CH—, —C≡C—, —COO—, —OCO—, —(CF 2 ) 2 —, —C≡C—COO—, —OCO—C≡C—, —CH═CH—(CH 2 ) 2 —, —(CH 2 ) 2 —CH═CH—, —CF═CF—, —C≡C—HC═CH—, or —CH═CH—C≡C—, and a indicates an integer of from 1 to 20; Z 4 represents a single bond or α,ω-alkylene having from 1 to 4 carbon atoms, and when Z 4 represents α,ω-alkylene having 3 or 4 carbon atoms, the —CH 2 — thereof directly bonded with A 4 may be substituted with —O—, —S—, —COO— or —OCO—; m, n and q each independently indicates 0, 1 or 2, but m+n+q≧1; wherein when m+n+q=1, any —CH 2 — of the alkyl represented by R 1 is not substituted with —CO— and Z 4 is a single bond; when m+n+q=1, Z 4 is a single bond and A 4 represents 1,4-phenylene, Z 1 , Z 2 and Z 3 each is not a single bond; and when m+n+q=2, A 1 , A 2 , A 3 and A 4 are 1,4-phenylene and Z 1 , Z 2 , Z 3 and Z 4 are single bonds, any —CH 2 — of the alkyl represented by R 1 is not substituted with —CO—.