Benzene derivatives, and a liquid crystal medium
AssigneeMerck Patent GmbH
InventorsAndreas Wachtler, Reinhard Hittich, Eike Poetsch, Herbert Plach, David Coates, Ulrich Finkenzeller, Thomas Geelhaar, Volker Reiffenrath, Bernhard Rieger
Life of this patent
Estimating the term…
Abstract
Benzene derivatives of the formula I ##STR1## in which n is 1 to 7, Q is --CO or --(CH.sub.2).sub.r --, where r is 1 to 5, s is 0, 1 or 2, t is 0 or 1, where s+t.gtoreq.1, X is F, Cl, --CF.sub.3, --CN, --OCF.sub.3 or --OCHF.sub.2, and Y, L and Z are each, independently of one another, H or F.
Claims11
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.sub.2).sub.r --, where r is 1 to 5, s is 0, 1 or 2, t is 0 or 1, where s+t.gtoreq.1, X is F, Cl, --OCF.sub.3 or --OCHF.sub.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.sub.3, --OCHF.sub.2 and --OCF.sub.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.
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.sub.2).sub.r --, where r is 1 to 5, s is 0, 1 or 2, t is 0 or 1, where s+t.gtoreq.1, X is F, Cl, --OCF.sub.3 or --OCHF.sub.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.sub.3, --OCHF.sub.2 and --OCF.sub.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.
Dependencies are inferred from the claim text.