| abstract |
Liquid-crystalline medium having at least two liquid-crystalline components, characterized in that it contains at least one compound of the formula I, in which R 1 is H or alkyl having 1 to 5 C atoms, R 2 is an unsubstituted or substituted by CN or CF 2 or at least one halogen-substituted alkyl or alkenyl radical having 1 to 10 carbon atoms, wherein in this radical also one or more CH 2 groups by -O- or -CO - can be replaced so that O atoms are not directly linked, CN, F, Cl, OCN, NCS, m 1 or 2 n 0 to 6, and r 0 or 1 mean, contains. |