Patent ID: 7648742

Claim:
A compound of the general formula I: in which: a, b, c, d and e independently of one another are 0 or 1; R 1 and R 2 independently of one another are hydrogen, —F, —Cl, —Br, —I, —CN, —SCN, —NCS, —SF 5 , an alkanyl, alkoxy, alkenyl or alkynyl having up to 15 carbon atoms, which is unsubstituted, monosubstituted by —CN or —CF 3 or monosubstituted or polysubstituted by F, Cl, Br and/or I, where in these radicals one or more CH 2 groups can also in each case independently of one another be replaced by —O—, —S —, —SO 2 —, —CO—, —COO—, —OCO— or —OCO—O—, such that hetero-atoms are not directly linked, or are a polymerizable group P; Y 1 is halogen, halogenated alkyl or halogenated alkoxy having 1-8 carbon atoms, Y 2 and Y 3 independently of one another are hydrogen, halogen, halogenated alkyl or halogenated alkoxy having 1 to 8 carbon atoms; A 1 , A 2 , A 3 and A 4 independently of one another are 1,4-phenylene which can be unsubstituted or mono- to tetrasubstituted independently of one another by —CN, —F, —Cl, —Br, —I, C 1 -C 6 -alkanyl which can be unsubstituted or mono- or poly-substituted by fluorine and/or chlorine, or C 1 -C 6 -alkoxy which can be unsubstituted or mono- or poly- substituted by fluorine and/or chlorine; 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexadienylene, in which —CH 2 — can independently of one another be replaced once or twice by —O— or —S— such that heteroatoms are not directly linked, and which can be unsubstituted or mono- or polysubstituted by —F, —Cl, —Br and/or —I; Z 1 , Z 2 , Z 3 and Z 4 independently of one another are a single bond, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, CF 2 CH 2 —, —CH 2 CF 2 —, —CFH—CHF—, —(CO)O—, —O(CO)—, —CH 2 O—, —OCH 2 —, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH— or —C≡C—; and in the oxygen heterocycle of the formula I is a C—C single bond and, if e is 1, can also be a C═C double bond.