Patent ID: 7435455

Claim:
A compound represented by the following formula (1): wherein R represents an alkyl having from 1 to 20 carbon atoms; and in this alkyl, any —CH 2 — may be replaced by —O—, —S—, —CO—, —CH═CH—, or —C≡C—; A 1 , A 2 , and A 3 each independently represents 1,4-cyclohexylene or 1,4-phenylene; in the 1,4-cyclohexylene, any —CH 2 — may be replaced by —O—, —S—, or —CO—, and any —(CH 2 ) 2 — may be replaced by —CH═CH—; in the 1,4-phenylene, any —CH═ may be replaced by —N═; and in these rings, any hydrogen may be replaced by fluorine, chlorine, —CN, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 , or —OCH 2 F; Z 1 , Z 2 , and Z 3 each independently represents a single bond, —(CH 2 ) 2 —, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —CH═CH—, —CF═CF—, —C≡C—, —(CH 2 ) 4 —, —O(CH 2 ) 2 O—, —(CH 2 ) 2 CF 2 O—, —(CH 2 ) 2 OCF 2 —, —CF 2 O(CH 2 ) 2 —, —OCF 2 (CH 2 ) 2 —, —CH═CH—CH 2 O—, or —OCH 2 —CH═CH—; X represents hydrogen, fluorine, chlorine, —CN, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 —, or —OCH 2 F; G represents oxygen or sulfur; n and m each independently represents 0, 1, or 2; and in any one of the following (i) to (iii), R may represent hydrogen: (i) the total sum of n and m is 1 or 2; (ii) X represents fluorine, chlorine, —CN, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 , or —OCH 2 F; and (iii) at least one of A 1 , A 2 , and A 3 represents 1,4-phenylene in which any hydrogen is replaced by fluorine, chlorine, —CN, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 , or —OCH 2 F.