Patent ID: 7981486

Claim:
A compound represented by the following formula (1): wherein Ra and Rb are independently alkyl having from 1 to 20 carbons, wherein arbitrary —CH 2 — in the alkyl may be replaced by —O—, —S—, —CO— or —SiH 2 —, arbitrary —(CH 2 ) 2 — may be replaced by —CH═CH— or —C═C—, and wherein arbitrary hydrogen may be replaced by halogen; wherein ring A 1 is independently 1,4-cyclohexylene, 1,4-phenylene, pyridine-2,5-diyl, pyridazine-3,6-diyl, decahydronaphthalene-2,6-diyi, 1,2,3,4-tetrahydronaphthalene-2,6-diyl or naphthalene-2,6-diyl, wherein arbitrary —CH 2 — in each of A 1 may be replaced by —O—, —S—, —CO— or —SiH 2 —, and wherein arbitrary —(CH 2 ) 2 — in each of A 1 may be replaced by —CH═CH—, and wherein arbitrary hydrogen in each of A 1 may be replaced by halogen, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 or —OCH 2 F; wherein Z 1 is independently a single bond or alkylene having from 1 to 4 carbons, wherein arbitrary —CH 2 — in the alkylene may be replaced by —O—, —S—, —CO— or —SiH 2 —, wherein arbitrary —(CH 2 ) 2 — in the alkylene may be replaced by —CH═CH— or and wherein arbitrary hydrogen may be replaced by halogen; wherein W is alkylene having from 2 to 4 carbons, wherein arbitrary —CH 2 — in the alkylene may be replaced by —O—, —S—, —CO— or —SiH 2 —, wherein arbitrary —(CH 2 ) 2 — in the alkylene may be replaced by —CH═CH— or —C≡C—, and wherein arbitrary hydrogen may be replaced by halogen; wherein Y 1 is independently hydrogen, halogen, —CN, —CF 3 , —CHF 2 , —CH 2 F, —CF 3 , —OCHF 2 or —OCH 2 F, but wherein at least one of Y 1 is chlorine, —CF 3 , —CHF 2 , —CH 2 F, —OCF 3 , —OCHF 2 or —OCH 2 F; wherein Rc is alkyl having from 1 to 4 carbons; and wherein m is independently 0, 1 or 2; but wherein the sum of plural numbers of m is 0, 1 or 2.