Liquid crystals

Details Liquid crystals Liquid crystals

1984-03-05

1987-06-30

Gron, Teddy S.

Compositions

Radioactive compositions

Nuclear reactor fuel

2522995, 2522996, 25229961, 25229963, 25229964, 25229965, 25229966, 25229967, 350350S, 260464, 260465R, 260465C, 260465D, 560 51, 560 59, 560 65, 560 66, 560 73, 560102, 560104, 560106, 560107, 560108, 560109, 560111, 560113, 560118, 560125, 560126, 560128, 560138, 560141, 568324, 568325, 568331, 568367, 568335, 568641, 568631, 570128, 585 20, 585 25, 544315, 544335, 544318, 544333, 544334, 544242, 544238, 544239, 544224, 544241, 549370, 549372, 549374, 549375, 549369, 558411, 558414, 558431, C09K 334, C07

Patent

active

046766049

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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