Liquid-crystalline medium

A liquid-crystalline medium having a positive dielectric anisotropy, comprising one or more compounds of Formula G

• and one or more compounds of Formula U
• in which the individual substituents have the following meanings:
• R1, R2, each, independently of one another, denote a H atom,
• R4 and R5 an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non-adjacent CH2 groups are optionally substituted by —C≡C—, —CF2O—, —OCF2—, —CH═CH—,
• —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom or a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms;
• R3 and R6 each, independently of one another, denote a H atom, an alkyl group having 1 to 3 C atoms or an alkenyl group having 2 to 3 C atoms in which one or more non-adjacent CH2 groups are optionally substituted by —C≡C—, —CF2O—, —OCF2—, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another;
• A1 to A4 each, independently of one another, denote phenylene-1,4-diyl, in which, in addition, one or two CH groups may be replaced by N and one or more H atoms may be replaced by halogen, CN, CH3, CHF2, CH2F, CF3, OCH3, OCHF2 or OCF3, cyclohexane-1,4-diyl, in which, in addition, one or two non-adjacent CH2 groups may be replaced, independently of one another, by O and/or S and one or more H atoms may be replaced by F, cyclohexene-1,4-diyl, bicyclo[1.1.1]pentane-1,3-diyl, bicyclo[2.2.2]octane-1,4-diyl, spiro-[3.3]heptane-2,6-diyl, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl;
• Z1 to Z4 each, independently of one another, denote —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CO—O—, —O—CO—, —C2H4—, —C2F4—, —CF2CH2—, —CH2CF2—, —CFHCFH—, —CFHCH2—, —CH2CFH—, —CF2CFH—, —CFHCF2—, —CH═CH—, —CF═CH—, —CH═CF—, —CF═CF—, —C≡C— or a single bond;
• and
• k, l, m, n each, independently of one another, denote 0, 1, 2 or 3;
• and
• one or more compounds selected from the group consisting of the following formulae:
• in which the individual substituents have the following meanings:
• in which the individual substituents have the following meanings:
• R0 denotes a H atom, a halogen atom, —CN, —SCN, —NCS, an alkyl of an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non-adjacent CH2 groups are optionally substituted by —C≡C—, —CF2O—, —OCF2—, —CH═CH—,
• —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom or a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms, in which one or more H atoms may be replaced by a halogen atom;
• X0 denotes F, Cl, a halogenated alkyl group, a halogenated alkenyl group, a halogenated alkoxy group or a halogenated alkenyloxy group having up to 6 C atoms;
• L1 to L6 each, independently of one another, denote H, F or Cl;
• and
• Y0 each, independently of one another, denote H or CH3.