Fluorierte Phenanthren-Derivate und ihre Verwendung in flüssigkristallinen Mischungen

摘要

Disclosed are fluorinated phenanthrene derivatives of formula (I), in which the symbols and indices have the following meanings: E<1>, E<2>, E<3>, E<4>, E<5> and E<6> are identical or different and stand for -N-, -CF- or -CH-; G is -CF2CF2- or -CF=CF-; R<1> and R<2> are (for example) alkyl or alkoxy; M<1>, M<2>, M<3>, M<4> are (for example) O, -CO-O-, -O-CO- or a single bond; A<1> and A<2> are (for example) 1,4-phenylene or pyrimidine-2,5-diyl; and m and n are nought or 1, their sum being not more than 1. The claimed compounds are suitable for use as components in liquid crystal mixtures.