Patent ID: 7767277

Claim:
A compound of formula I in which R 1 denotes H, F, Cl, Br, a halogenated or unsubstituted alkyl radical having 1 to 15 C atoms, in which one or more CH 2 groups are optionally, independently of one another, replaced by —C≡C—, —(CO)O—, —O(CO)—, —(CO)— or —O— in such a way that O atoms are not linked directly to one another, A 1 denotes a) trans-1,4-cyclohexylene or cyclohexenylene, in which one or more non-adjacent CH 2 groups are optionally 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 are optionally replaced by N and in which one or more H atoms are optionally replaced by Br, Cl, F, CN, methyl, methoxy or a mono- or polyfluorinated methyl or methoxy group, Z 1 denotes 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 where an asymmetrical Z 1 group may be oriented to either direction in formula I, L 1 and L 2 , independently of one another, denote H or F, X 1 denotes F, Cl, CN, SF 5 , a halogenated alkyl radical, halogenated alkoxy radical, halogenated alkenyl radical or halogenated alkenyloxy radical, each having up to 7 C atoms, and a denotes 0, 1 or 2.