Patent ID: 7846513

Claim:
A compound represented by the following formula (1): wherein Ra and Rb are independently hydrogen or 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-diyl, 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 —C≡C—, and wherein arbitrary hydrogen may be replaced by halogen; wherein W is —COO—, —OCO—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —CH═CH—, —CH═CF—, —CF═CH—, —CF═CF—, —C≡C—, —CH 2 CO—, —COCH 2 —, —CH 2 SiH 2 —, —SiH 2 CH 2 —, —(CH 2 ) 4 —, —(CH 2 ) 2 COO—, —OCO(CH 2 ) 2 —, —(CH 2 ) 3 O—, —O(CH 2 ) 3 —, (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—, —OCH 2 —CH═CH—, —CF 2 CH 2 —, —(CH 2 ) 2 OCH 2 —, —CH 2 S—; wherein Y 1 is hydrogen or fluorine , and wherein at least one of Y 1 is fluorine; wherein Rc is alkyl having from 1 to 4 carbons, wherein arbitrary —CH 2 — in the alkyl may be replaced by —O—, —S—, —CO— or —SiH 2 —, wherein m is independently 0, 1 or 2; but wherein the sum of plural numbers of m is 0, 1 or 2.