Liquid-crystalline medium

A liquid-crystalline medium comprising:

• at least one compound selected from the group of the compounds of the formulae IA to IH,
• in which
• Z1 denotes a single bond, —CH2CH2—, —CH═CH—, —CH2O—, —OCH2, —CF2O—, —OCF2—, —COO—, —OCO—, —C2F4—, —(CH2)4—, —CHFCHF—, —CF2CH2—, —CH2CF2—, —C≡C—, —CF═CF—, or —CH2CF2O—;
• at least one compound selected from the compounds of the following formulae:
• in which
• R2A, R2B and R2C each, independently of one another, denote H, an alkyl having 1 to 15 C atoms or alkenyl radical having 2 to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals may each be replaced by —O—, —S—,
• —C≡C—, —CF2O—, —OCF2—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, a cyclopropyl ring, cyclobutyl ring or cyclopentyl ring,
• L1-4 each, independently of one another, denote F, Cl, CF3 or CHF2,
• L5 is CH3,
• Z2 and Z2′ each, independently of one another, denote a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF—, —C≡C—, or —CH═CHCH2O—,
• p denotes 0, 1 or 2,
• q denotes 0 or 1, and
• v denotes 1 to 6;
• and wherein the medium has a negative dielectric anisotropy, Δε.