Patent ID: 8012547

Claim:
A compound of formula I in which R 1 and R 2 each, independently of one another, denote H, F, Cl, Br, a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, in which, in addition, one or more CH 2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CH═CH—, —(CO)O—, —O(CO)—, —(CO)—or —O— in such a way that O atoms are not linked directly to one another, where R 2 may also denote CN, SCN, NCS or SF 5 , A 1 , A 2 , A 3 and A 4 each, independently of one another, identically or differently, denote: a) trans-1,4-cyclohexylene or cyclohexenylene, in which, in addition, one or more non-adjacent CH 2 groups may be replaced by —O— and/or —S— and in which H may be substituted by F, b) 1,4-phenylene, in which one or two CH groups may be replaced by N and in which, in addition, one or more H atoms may be replaced by Br, Cl, F, CN, methyl, methoxy or a mono- or polyfluorinated methyl or methoxy group, or c) a radical from the group 1,4-bicyclo[2.2.2]octylene, piperidine-1,4-diyl, cyclobut-1,3-diyl, spiro[3.3]heptane-2,6-diyl, in which hydrogen atoms may be mono- or polysubstituted by F, CN, SCN, SF 5 , CH 2 F, CHF 2 , CF 3 , OCH 2 F, OCHF 2 or OCF 3 , one or more double bonds may be replaced by single bonds, M, M 1 or M 2 denotes —O—, —S—, —CH 2 —, —CHY— or —CYY 1 — in such a way that adjacent groups do not simultaneously denote —O— or —S—, and Y and Y 1 denote Cl, F, CN, OCF 3 or CF 3 , V denotes H or F, Z 1 , Z 2 and Z 3 each, independently of one another, identically or differently, denote a single bond, —CH 2 O—, —(CO)O—, —CF 2 O—, —CH 2 CH 2 CF 2 O—, —CF 2 CF 2 —, —CH 2 CF 2 —, —CH 2 CH 2 —, —(CH 2 ) 4 —, —CH═CH—, —CH═CF—, —CF═CF— or —C≡C—, where asymmetrical bridges may be oriented to both sides, and a denotes 0, 1 or 2, b denotes 0, 1 or 2, and c denotes 0, 1 or 2, where a+b+c is ≦4.