Liquid-crystalline medium and liquid-crystal display comprising the same and compounds

A liquid-crystalline medium, comprising one or more compounds of formula C:

• in which
• denotes
• denotes, in each occurrence independently of one another,
• RC1 and RC2 independently of one another, denote an alkyl radical having 1 to 15 C atoms, wherein one or more CH2 groups in these radicals are each optionally replaced, independently of one another, by —CH═CH—, —C≡C—, —CF2O—, —OCF2—, —O—, —(CO)—O—, —O—(C═O)—, cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, 1,2-cyclopropyl, alkyl, alkenyl, alkenyloxy, alkoxyalkyl, or fluorinated alkenyl having 2 to 7 C atoms, 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 halogen;
• and
• wherein the respective rings are each optionally substituted by one or two alkyl groups;
• one or more compounds of formula B:
• in which
• denotes
• denotes, in each occurrence independently of one another,
• n denotes 1 or 2;
• denotes an alkyl radical having 1 to 15 C atoms, wherein one or more CH2 groups in these radicals are each optionally replaced, independently of one another, by —CH═CH—, —C≡C—, —CF2O—, —OCF2—, —O—, —(CO)—O—, —O—(C═O)—, cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, 1,2-cyclopropyl, alkyl, alkenyl, alkenyloxy, alkoxyalkyl, or fluorinated alkenyl having 2 to 7 C atoms, 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 halogen;
• and
• X1 denotes F, Cl, or a fluorinated alkyl, alkenyl, alkoxy, or alkenyloxy group having 1 to 4 C atoms;
• and
• one or more dielectrically neutral compounds of formula V:
• in which
• R51 and R52 independently of one another, denote an alkyl radical having 1 to 15 C atoms, wherein one or more CH2 groups in these radicals are each optionally replaced, independently of one another, by —CH═CH—, —C≡C—, —CF2O—, —OCF2—, —O—, —(CO)—O—, —O—(C═O)—, cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, 1,2-cyclopropyl, alkyl, alkenyl, alkenyloxy, alkoxyalkyl, or fluorinated alkenyl having 2 to 7 C atoms, 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 halogen;
• if present, each, independently of one another, denote
• Z51 to Z53 each, independently of one another, denote —CH2—CH2—, —CH2—O—, —CH═CH—, —C≡C—, —COO—, or a single bond;
• and
• i and i each, independently of one another, denote 0 or 1,
• wherein the respective rings are each optionally substituted by one or two alkyl groups;
• and
• wherein the liquid-crystalline medium has a positive dielectric anisotropy.