Liquid crystals

Details Liquid crystals Liquid crystals

1984-03-05

1986-01-21

Gron, Teddy S.

Compositions

Radioactive compositions

Nuclear reactor fuel

2522995, 25229961, 549369, 549373, 549376, G02K 113, C09K 334, C07D31906

Patent

active

045654255

ABSTRACT:
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.

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Sorkin, H., Mol. Cryst. Liq. Cryst., vol. 56 (Letters), pp. 279-281 (1980).
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Praefcke, K., et al., Chemiker-Zeitung, vol. 104, pp. 269-271 (1980).

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