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US 4,629,581 AGranted
Cyclohexanecarbonitriles
AssigneeHoffmann-La Roche Inc.
InventorsArthur Boller, Martin Petrzilka, Martin Schadt
Life of this patent
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AssigneeHoffmann-La Roche Inc.
InventorsArthur Boller, Martin Petrzilka, Martin Schadt
Estimating the term…
Compounds of the formula ##STR1## wherein R.sup.1 is hydrogen or straight-chain alkyl; R.sup.2 is --CN, --R, --COR, --COOR or when R.sup.2 is positioned on an aromatic ring R.sup.2 also can be --OR, --OOCR or --F; R is alkyl; A is a group with 1 to 4 six-membered rings, these rings being linked directly with one another and with ring B in each case via a single covalent bond or being linked at one or two positions also via --COO--, --OOC-- or --CH.sub.2 CH.sub.2 --; the six-membered rings in A and ring B each are 1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also is trans-2,5-disubstituted m-dioxane, 2,5-disubstituted pyrimidine or 3,6-disubstituted pyridazine, with the proviso that a maximum of two adjacent trans-1,4-cyclohexylene rings are linked directly via a single covalent bond; and m is the integer 2, or when ring B is trans-1,4-cyclohexylene or trans-2,5-disubstituted m-dioxane, m also can be the integer 0, their manufacture, liquid crystalline mixtures which contain these compounds as well as the use of these compounds for electro-optical purposes are described. Additionally, compounds of the formula ##STR2## wherein R.sup.8 is straight-chain C.sub.1 -C.sub.12 alkyl, their manufacture, liquid crystalline mixtures which contain these compounds and their use for electro-optical purposes are described.
A compound of the fomrula
The compound of 27 wherein R.sup.1 is trans-3-alkenyl, 4-alkenyl or alkyl.
A liquid crystalline mixture comprising at least two components at least one of which is a compound of the formula ##STR29## wherein X.sup.1 is a single covalent bond, --CH.sub.2 CH.sub.2 --, --COO--, --OOC-- or 1,4-phenylene;
An electro-optical cell comprising:
Dependencies are inferred from the claim text.