Patent ID: 7914862

Claim:
A compound represented by formula (1-1) or (1-2): wherein R 1 and R 2 are each independently alkyl having 1 to 10 carbons, in the alkyl arbitrary—CH 2 — may be replaced by —O—, —S—, —CO— or —SiH 2 —, provided that plural —CH 2 — adjacent to each other are not replaced simultaneously, and arbitrary —(CH 2 ) 2 — may be replaced by —CH═CH— or —C≡C—; ring G and ring J are each independently 1,4-cyclohexylene or 1,4-phenylene, in the 1,4-cyclohexylene arbitrary —CH 2 — may be replaced by —O—, —S—, —CO— or —SiH 2 —, and arbitrary —(CH 2 ) 2 — may be replaced by —CH═CH—, in the 1,4-phenylene arbitrary —CH═ may be replaced by—N═, and in the rings arbitrary hydrogen may be replaced by halogen, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 or —OCH 2 F; Z 1 , Z 2 and Z 3 are each independently a single bond, —CH 2 O— or —OCH 2 —, provided that one of Z 1 , Z 2 and Z 3 is —CH 2 O— or —OCH 2 —; and s and t are each independently 0, 1, 2 or 3, provided that the sum of s and t is 1, 2 or 3, provided that when s=0, one of Z 2 and Z 3 is —CH 2 O— or —OCH 2 —, in formula (1-1), when t=0, one of Z 1 and Z 3 is —CH 2 O— or —OCH 2 —, and in formula (1-2), when t=0, Z 3 is —CH 2 O— or —OCH 2 —.