Patent ID: 6908645

Claim:
A liquid-crystalline medium based on a mixture of polar compounds, which comprises one or more compounds of the formula I in which R 1 is an alkyl radical having from 1 to 12 carbon atoms which is unsubstituted, monosubstituted by CN or CF 3 or monosubstituted to perhalo-substituted by halogen, where one or more CH 2 groups in these radicals, in each case independently of one another, are optionally replaced by —O—, —S—, —CH═CH—, —C≡C—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a way that O atoms are not linked directly to one another, L 1-6 are each, independently of one another, H or F, Z 1 is —CF 2 O— and Z 2 is —COO—, X is F, Cl, CN, OCN, NCS, SCN, SF 5 , an unsubstituted alkyl or alkoxy radical, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having up to 6 carbon atoms and up to perhalo substitution, u is 1 or 2, and v is 1 or 2, provided that: when R 1 is alkyl, u is 1, v is 1 and X is F, CN, an alkyl radical, halogenated alkyl radical or a halogenated alkoxy radical; the A ring is not phenyl or fluorinated phenyl.