Benzene derivatives, and a liquid crystal medium

Claim 2

A liquid-crystalline medium for electro-optical displays , consisting essentially of at least two liquid crystalline components, wherein at least one component is a benzene derivative of Formula I ##STR19## in which n is 1 to 7, Q is --(CH 2 ) r --, where r is 1 to 5, s is 0, 1 or 2, t is 0 or 1, where s+t≧1, X is F, Cl, --OCF 3 or --OCHF 2 , and Y and L are each, independently of one another, H or F, and the other components are selected from the Formulae 1b, 2b, 3b, 4b and 5b and optionally 1a, 2a, 3a, 4a, and 5a: R'--L--E--R" 1b R'--L--COO--E--R" 2b R'--L--OOC--E--R" 3b R'--L--CH.sub.2 CH.sub.2 --E--R"4b R'--L--C.tbd.C--E--R" 5b wherein L and E are each independently a divalent radical selected from the group consisting of --Phe--, --Cyc--, --Phe--Phe, --Phe--Cyc--, --Cyc--Cyc, --Pyr--, --Dio--, --G--Phe--, --G--Cyc-- and their mirror images, where Phe is unsubstituted or fluorinesubstituted 1,4-phenylene, Cyc is trans-1,4-cyclohexylene or 1,4-cyclohexenylene, Pyr is pyrimidine-2,5-diyl or pyridine-2,5-diyl, Dio is 1,3-dioxane-2,5-diyl and G is 2-(trans-1,4-cyclohexyl)ethyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl or 1,3-dioxane-2,5-diyl, R' is alkyl or alkenyl having up to 8 carbon atoms and R" is selected from the group consisting of --F, --Cl, --CF 3 , --OCHF 2 and --OCF 3 , or R'--L--E--R" 1a R'--L--COO--E--R" 2a R'--L--OOC--E--R" 3a R'--L --CH.sub.2 CH.sub.2 --E--R" 4a R'--L--C.tbd.C--E--R" 5a wherein R' and R" are each independently alkyl, alkenyl, alkoxy, alkenyloxy or alkenoyloxy of up to 8 carbon atoms.

Claim 3

A medium according to claim 1, which contains one or more compounds of Formula I wherein Y is F.

Claim 4

A medium according to claim 2, which contains one or more compounds of Formula I wherein X is F.

Claim 5

A medium according to claim 1, which contains one or more compounds of Formula I wherein n is 1.

Claim 6

A medium according to claim 1, which contains one or more compounds of the formula ##STR20##

Claim 7

A medium according to claim 1, which contains one or more compounds of Formula I wherein X is OCF 3 .

Claim 8

A medium according to claim 1, which contains one or more compounds of Formula I wherein r is 3, 4 or 5.

Claim 9

An electro-optical display based on a liquid-crystal cell, wherein the liquid-crystal cell contains a medium according to claim 1.

Claim 10

A display according to claim 8, having an active matrix.

Claim 11

A medium according to claim 1, wherein the amount of cyano components present is not more than 5%.

Claim 12

A liquid-crystalline medium for electro-optical displays consisting of at least two liquid crystalline components, wherein at least one component is a benzene derivative of Formula I ##STR21## in which n is 1 to 7, Q is --(CH 2 ) r --, where r is 1 to 5, s is 0, 1 or 2, t is 0 or 1, where s+t≧1, X is F, Cl, --OCF 3 or --OCHF 2 , and Y and L are each, independently of one another, H or F, and the other components are selected from the Formulae 1b, 2b, 3b, 4b and 5b and optionally 1a, 2a, 3a, 4a, and 5a: R'--L--E--R" 1b R'--L--COO--E--R" 2b R'--L--OOC--E--R" 3b R'--L--CH.sub.2 CH.sub.2 --E--R" 4b R'--L--C.tbd.C--E--R" 5b wherein L and E are each independently a divalent radical selected from the group consisting of --Phe--, --Cyc--, --Phe--Phe, --Phe--Cyc--, --Cyc--Cyc, --Pyr--, --Dio--, --G--Phe--, --G--Cyc-- and their mirror images, where Phe is unsubstituted or fluorinesubstituted 1,4-phenylene, Cyc is trans-1,4-cyclohexylene or 1,4-cyclohexenylene, Pyr is pyrimidine-2,5-diyl or pyridine-2,5-diyl, Dio is 1,3-dioxane-2,5-diyl and G is 2-(trans-1,4-cyclohexyl)ethyl, pyrimidine-2,S-diyl, pyridine-2,5-diyl or 1,3-dioxane-2,5-diyl, R' is alkyl or alkenyl having up to 8 carbon atoms and R" is selected from the group consisting of --F, --Cl, --CF 3 , --OCHF 2 and --OCF 3 , or R'--L--E--R" 1a R'--L--COO--E--R" 2a R'--L--OOC--E--R" 3a R'--L--CH.sub.2 CH.sub.2 --E--R" 4a R'--L--C.tbd.C--E--R" 5a wherein R' and R" are each independently alkyl, alkenyl, alkoxy, alkenyloxy or alkenoyloxy of up to 8 carbon atoms.

Claim 13

A liquid-crystalline medium for electro-optical displays consisting of at least two liquid crystalline components, wherein at least one component is a benzene derivative of Formula I ##STR21## in which n is 1 to 7, Q is --(CH 2 ) r --, where r is 1 to 5, s is 0, 1 or 2, t is 0 or 1, where s+t≧1, X is F, Cl, --OCF 3 or --OCHF 2 , and Y and L are each, independently of one another, H or F, and the other components are selected from the Formulae 1b, 2b, 3b, 4b and 5b and optionally 1a, 2a, 3a, 4a, and 5a: R'--L--E--R" 1b R'--L--COO--E--R" 2b R'--L--OOC--E--R" 3b R'--L--CH.sub.2 CH.sub.2 --E--R" 4b R'--L--C.tbd.C--E--R" 5b wherein L and E are each independently a divalent radical selected from the group consisting of --Phe--, --Cyc--, --Phe--Phe, --Phe--Cyc--, --Cyc--Cyc, --Pyr--, --Dio--, --G--Phe--, --G--Cyc-- and their mirror images, where Phe is unsubstituted or fluorinesubstituted 1,4-phenylene, Cyc is trans-1,4-cyclohexylene or 1,4-cyclohexenylene, Pyr is pyrimidine-2,5-diyl or pyridine-2,5-diyl, Dio is 1,3-dioxane-2,5-diyl and G is 2-(trans-1,4-cyclohexyl)ethyl, pyrimidine-2,S-diyl, pyridine-2,5-diyl or 1,3-dioxane-2,5-diyl, R' is alkyl or alkenyl having up to 8 carbon atoms and R" is selected from the group consisting of --F, --Cl, --CF 3 , --OCHF 2 and --OCF 3 , or R'--L--E--R" 1a R'--L--COO--E--R" 2a R'--L--OOC--E--R" 3a R'--L--CH.sub.2 CH.sub.2 --E--R" 4a R'--L--C.tbd.C--E--R" 5a wherein R' and R" are each independently alkyl, alkenyl, alkoxy, alkenyloxy or alkenoyloxy of up to 8 carbon atoms.