Novel tetra- and penta-nuclear compounds with a phenylene group linked via a difluoromethylene ether group are useful in displays for out-of-doors, automobile or avionic applications

摘要

Tetra- and penta-nuclear compounds which also contain a -CF2O-linked phenylene group are new. Novel tetra- and penta-nuclear compounds which also contain a -CF2O-linked phenylene group are of formula (I). R1 and R2 = up to 15C alkyl or alkenyl optionally substituted once by CN or CF3 or at least once by halogen and optionally with one or more -CH2-group replaced by -O-, -S-, 1,3-cyclobutylene, -CO-, -CO-O-, -O-CO- or -O-CO-O- with the proviso that the O atoms are not directly linked to each other; Z = -CF2O- or a single bond; 1-L3 = H or F; m = 1 or 2. An Independent claim is also included for liquid crystal media comprising mixtures of (I) with compounds such as (II) (a total of 7 different types of compound given in the claim). R0 = n-alkyl, oxaalkyl, fluoroalkyl or alkenyl with up to 9C; X0 = F, Cl, 1-6C halogenated alkyl or alkoxy or 2-6C halogenated alkenyl; Y1 and Y2 = H or F; r = 0 or 1.