Patent ID: 8747695

Claim:
A compound of formula I in which A 1-5 , independently of one another, denote a) a radical of the formula b) 1,4-phenylene, in which one or more CH groups are optionally replaced by N, c) trans-1,4-cyclohexylene or cyclohexenylene, in which one or two non-adjacent CH 2 groups are optionally replaced by —O— and/or —S— and in which H are optionally replaced by F, or d) 1,4-bicyclo[2.2.2]octylene, cyclobut-1,3-diyl, spiro[3.3]heptane-2,6-diyl, thiophene-2,5-diyl, thiophene-2,4-diyl, furan-2,5-diyl, furan-2,4-diyl, and in which groups a), b), c) and d), one or more H atoms are also optionally replaced by Br, Cl, F, CN, —NCS, —SCN, SF 5 , C 1 -C 10 alkyl, C 1 -C 10 alkoxy or a mono- or polyfluorinated C 1 -C 10 alkyl or alkoxy group, and where the compound of formula I comprises at least one radical according to a), R 1 denotes a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, in which one or more CH 2 groups are each optionally replaced, independently of one another, by —C≡C—, —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —(CO)O—, —O(CO)—, —(CO)— or —S— in such a way that O or S atoms are not linked directly to one another, R 2 denotes an alkyl radical having 2 to 5 C atoms, in which one or more CH 2 groups are each optionally replaced, independently of one another, by —C≡C—, —CH═CH—, —CF═CF—, —CF═CH—, —CH═CF—, —(CO)O—, —O(CO)— or —(CO)— in such a way that O atoms are not linked directly to one another, or F, CF 3 , OCF 3 , SCN, NCS or SF 5 , Z 1 , Z 5 , independently of one another, denote a single bond, —C≡C—, —CH═CH—, —CH 2 O—, —(CO)O—, —CF 2 O—, —CF 2 CF 2 —, —CH 2 CF 2 —, —CH 2 CH 2 —, —(CH 2 ) 4 —, —CH═CF— or —CF═CF—, where asymmetrical bridges may be oriented to either direction, and m, n, independently of one another, denote 0, 1 or 2, where the compound of formula I-X-2 in which R 1 and R 2 simultaneously denote n-C 4 H 9 , are excluded.