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 may each be 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 0 atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen, and
• wherein the respective rings may each be substituted by one or two alkyl groups, preferably by methyl and/or ethyl groups, and
• one or more compounds of formula B,
• in which
• denotes
• denotes, in each occurrence independently of one another,
• n denotes 1 or 2,
• R1 has one of the meanings given for RC1, and
• X1 denotes F, Cl, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy.