Liquid-crystalline medium

A liquid-crystalline medium, consisting of at least one compound of formula I,

• in which
• R1 and R1* each, independently of one another, denote H, an alkyl or alkoxy radical having 1 to 15 C atoms, in which one or more CH2 groups may each be replaced, independently of one another, 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 halogen,
• X denotes —O—, and
• L2 and L2 each, independently of one another, denote F, Cl, CF3 or CHF2,
• and at least one compound of the following formulae ST,
• in which
• RST denotes H, an alkyl or alkoxy radical having 1 to 15 C atoms, in which one or more CH2 groups may each be replaced, independently of one another, 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 halogen,
• denotes
• ZST each, independently of one another, denotes —CO—O—, —O—CO—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CH2—, —CH2CH2—, —(CH2)4—, —CH═CH—CH2O—, —C2F4—, —CH2CF2—, —CF2CH2—, —CF═CF—, —CH═CF—, —CF═CH—, —CH═CH—, —C≡C— or a single bond,
• L2 and L2 each, independently of one another, denote F, Cl, CF3 or CHF2,
• p denotes 1 or 2, and
• q denotes 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10,
• and at least one compound of formula IIA or IIB
• in which
• R2A and R2B each, independently of one another, denote H, a C1-15-alkyl or C2-15-alkenyl radical which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, in which one or more CH2 groups 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—, or —CH═CHCH2O—,
• p denotes 0, 1 or 2,
• q denotes 0 or 1, and
• denotes 1 to 6,
• and one or more compounds of formulae L-1 to L-11,
• in which
• R, R1 and R2 each, independently of one another, denote H, a C1-15-alkyl or C2-15-alkenyl radical which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, in which one or more CH2 groups 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,
• (O) represents an optionally present oxygen atom, and
• s denotes 1 or 2.