Liquid-crystalline media

A liquid-crystalline medium comprising:

• (i) at least one compound of the formula I,
• in which
• R1 and R1* each, independently of one another, denote an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CF2O—, —CH═CH—, , ,
• —O—, —CO—O—, —O—CO— in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen,
• Z1 denotes a single bond, —CH2CH2—, —CH═CH—, —CH2O—, —OCH2—, —CF2O—, —OCF2—, —COO—, —OCO—, —C2F4—, —CF═CF—, —CH═CHCHO—,
• L1 and L2 each, independently of one another, denote F, Cl, CF3 or CHF2;
• (ii) one or more compounds selected from the group consisting of compounds of the formulae L-1 to L-11, CCH-nOm, P-4, and EY,
• in which
• R, R1 and R2 each, independently of one another, denote H, an alkyl radical having up 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 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,
• alkyl denotes an alkyl radical having 1-6 C atoms, and
• s denotes 1 or 2;
• in which
• n and m each, independently of one another, denote 1, 2, 3, 4, 5 or 6,
• wherein
• R1 is an alkyl or alkoxy radical having 1 to 15 C atoms, wherein one or more CH2 groups in these radicals are optionally replaced, independently of one another, by —C≡C—, —CF2O, —CH═CH—,
• —O—, —CO—O—, —O—CO— in such a way that O atoms are not linked directly to one another, and wherein, in addition, one or more H atoms may be replaced by halogen;
• in which
• R1 and R1* each, independently of one another, denote an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CF2O—, —CH═CH—, , , —O—, —CO—O—, —O—CO— in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen,
• L1 and L2 each, independently of one another, denote F, Cl, CF3 or CHF2;
• and
• (iii) at least two compounds selected from the group of compounds of formulae IIA, IIB and IIC,
• in which
• R2A and R2B each, independently of one another, denote H, an alkyl or alkenyl radical having up 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 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,
• R2c each, independently of one another, denote H, an alkyl radical having up 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 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,
• L1-4 each, independently of one another, denote F or Cl,
• Z2 and Z2′ each, independently of one another, denote a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF—, —CH═CHCH2O—,
• p denotes 1 or 2,
• q denotes 1 or 2, and
• v denotes 1 to 6.