Patent ID: 8163200

Claim:
A compound of formula I wherein R 1 is H, F, Cl, Br, a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, where one or more CH 2 groups in these radicals are each optionally replaced, independently of one another, by —C≡C—, —CH═CH—, or —O— in such a way that O atoms are not linked directly to one another, R 2 is F, Cl, OCF 3 , OCHF 2 , OCHFCF 3 , OCF 2 CHFCF 3 , CF 3 , CN, SF 5 , or NCS, A 1 and A 2 are each, independently of one another, identically or differently: a) trans-1,4-cyclohexylene or cyclohexenylene, in which, in addition, one or more non-adjacent CH 2 groups are each optionally replaced by —O— and/or —S—, and in which H atoms are optionally replaced by F, b) 1,4-phenylene, in which one or two CH groups are each optionally replaced by N and in which, in addition, one or more H atoms are optionally replaced by Br, Cl, F, CN, methyl, methoxy, or a mono- or polyfluorinated methyl or methoxy group, or c) 1,4-bicyclo[2.2.2]octylene, piperidine-1,4-diyl, cyclobutane-1,3-diyl, spiro[3.3]heptane-2,6-diyl, in which one or more hydrogen atoms are each optionally replaced 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 are each optionally replaced by single bonds, A 3 and A 4 are each, independently of one another, identically or differently: b) 1,4-phenylene, in which one or two CH groups are each optionally replaced by N and in which, in addition, one or more H atoms are optionally replaced by Br, Cl, F, CN, methyl, methoxy, or a mono- or polyfluorinated methyl or methoxy group, or c) 1,4-bicyclo[2.2.2]octylene, piperidine-1,4-diyl, cyclobutane-1,3-diyl, spiro[3.3]heptane-2,6-diyl, in which one or more hydrogen atoms are each optionally replaced 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 are each optionally replaced by single bonds, M, M 1 or M 2 are each —O—, —S—, —CH 2 —, —CHY— or —CYY 1 — in such a way that adjacent groups are not simultaneously —O— or —S—, Y and Y 1 are each Cl, F, CN, OCF 3 or CF 3 , V is H or F, Z 1 , Z 2 and Z 3 are each, independently of one another, identically or differently, 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, a is 0, 1 or 2, b is 1 or 2, and c is 0, 1 or 2, where a+b+c is ≦4.