Liquid-crystalline medium

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

• in which:
• R1 and R2 each, independently of one another, denote an alkyl or alkoxy group having 1 to 12 C atoms or an alkenyl or 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-—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 are optionally replaced by a halogen atom or a cycloalkyl, cycloalkenyl, or cycloalkoxy group having 3 to 12 C atoms, in which one or more H atoms are optionally replaced by a halogen atom;
• R3 denotes 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, preferably H or CH3;
• L1 and L2 each, independently of one another, denote F, C, CF3, or CHF2;
• preferably L1 and L2 both denote F;
• and
• one or more compounds selected from the group consisting of compounds of Formulae YA, YB, YC, YD, YE, YF, YG, and B:
• in which:
• denotes one of
• R21 denotes an alkyl or alkoxy group having 1 to 12 C atoms or an alkenyl or 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 are optionally replaced by a halogen atom or a cycloalkyl or cycloalkoxy group having 3 to 12 C atoms, in which one or more H atoms are optionally replaced by a halogen atom;
• R22 denotes an alkyl or alkoxy group having 1 to 6 C atoms or an alkenyl or alkenyloxy group having 2 to 6 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 are optionally replaced by a halogen atom or a cycloalkyl or cycloalkoxy group having 3 to 6 C atoms, in which one or more H atoms are optionally replaced by a halogen atom;
• L1 to L3 each, independently of one another, denote F, Cl, CF3, or CHF2;
• L4 and L5 each, independently of one another, denote H or F;
• R23 denotes 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 0 atoms are not linked directly to one another, preferably H or CH3;
• Z1 and Z2 each, independently of one another, denote a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF—, or —CH═CHCH2O;
• Z3 denotes —CH2O—, —O—, —C2H4—, —OCH2—, or a single bond;
• Y1 denotes S, O, CH2, CH2CH2, CH2O, OCH2, or CH═CH;
• p denotes 0, 1, or 2;
• q denotes 0 or 1;
• r denotes 1 or 2;
• and
• z denotes 0 or 1.