Compounds of liquid crystalline medium and use thereof for high-frequency components

A compound of the formula I

• in which
• R1 denotes branched or unbranched alkyl having 1 to 15 C atoms or branched or unbranched alkenyl having 2 to 15 C atoms, where, in addition, one or more non-adjacent —CH2— groups in these radicals may be replaced by —O— and/or one or more H atoms may be replaced by halogen atoms,
• L11 is branched or unbranched alkyl having 1 to 12 C atoms, branched or unbranched alkenyl or alkynyl having 2 to 12 C atoms, where, in addition, one or more non-adjacent —CH2— groups in these radicals may be replaced by —O—, or denote substituted or unsubstituted cycloalkyl, cycloalkenyl, substituted or unsubstituted phenyl, substituted or unsubstituted arylethynyl,
• and
• on each occurrence, independently of one another, denote
• an aromatic or heteroaromatic ring system, in which, in addition, one or two CH groups may be replaced by N, and where the ring systems are optionally substituted by the substituents L11,
• or denote a cycloaliphatic ring system, in which, in addition, one or two non-adjacent —CH2— groups may be replaced by —O— and/or —S—,
• or denote 1,4-cyclohexenylene or 1,4-bicyclooctylene,
• Zll on each occurrence, independently of one another, denotes a single bond, —C≡C—, —CF═CF—, —CH═CH—, —OCF2—, —CH2—CH2— or —OCH2—,
• n denotes an integer in the range from 0 to 3.