Silylated benzoic acid derivatives

Abstract

The present invention relates to compounds of the formula ##STR1## in which Z is a halogen atom, a cyano group or a hydroxyl group, n is 0, 1 or 2, R' is a radical of the formula R"'--[Si(R*).sub.2 ].sub.x (CH.sub.2).sub.y R""-- (9), in which x is the number 0 or 1, y is an integer from 1 to 18, R"'is a defined in the description, R* is identical or different, optionally substituted C 1 - to C 18 -hydrocarbon or hydrocarbonoxy radicals, R"" is a phenylene or biphenylene radical or a radical of the formula --E--, where E is a divalent radical of the formula --O-- or --[Si(R*) 2 ] z --, and z is the number 0 or 1, and the compounds contain at least one group of the formula --Si(R*) 2 -- per molecule, and the radical R" is a cholesteryl radical, a radical as defined for R* or a radical of the formula --C 6 H 4 --R*, and the preparation and use thereof.

What is claimed is: 
     
       1. A liquid crystalline compound of the formula ##STR18## in which R 1  is a C 1  - to C 18  alkyl group, v is an integer having a value of from .Badd..[.0.]. .Baddend..Iadd.1 .Iaddend.to 10, y is an integer of from 3 to 12, R 4  is selected from the group consisting of a single chemical bond, a radical of the formula ##STR19## R 5  is a radical selected from the group consisting of divalent radicals of the formulas and halogenated, divalent radicals of the formulas ##STR20## R 6  is selected from the group consisting of R 1 , a halogen atom, a cyano group, a hydrogen atom, a C 1  - to C 18  alkoxy group, a C 1  - to C 18  alkyl group substituted with chlorine atoms and a group of the formula   --O--(CH.sub.2).sub.y --Si(CH.sub.3).sub.2 --[OSi(CH.sub.3).sub.2 ].sub.v --R.sup.1,                                                (66)     where y, v and R 1  are the same as above, with the proviso that if R 5  is a group of formula 64, R 6  is a C 1  -C 18  alkyl group substituted with chlorine atoms. .[.   
     
     
       2.  A compound of claim 1, wherein the compound is 4-octyloxyphenyl-4-(6-trimethylsilylhexyloxy)benzoate..]. 
     
     
       3. A display device containing the liquid crystalline compound of claim 1.