Optically active piperazinyl derivatives as liquid crystals

Details Optically active piperazinyl derivatives as liquid crystals Optically active piperazinyl derivatives as liquid crystals

1992-07-07

1994-10-18

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

2522995, 546287, 546193, 544298, 544358, 544295, C09K 1934, C09K 1954, C07D23902, C07D21190

Patent

active

053565592

ABSTRACT:
Optically active compounds of the formula ##STR1## wherein rings A.sup.1 and A.sup.2 each independently signify pyridine-2,5-diyl, pyrimidine-2,5-diyl or 1,4-phenylene, which is unsubstituted or substituted with at least one of halogen, cyano and/or methyl; R.sup.1 and R.sup.2 each independently represent alkyl with 1 to 18 carbon atoms in which optionally 1 --CH.sub.2 -- group or 2 non-adjacent --CH.sub.2 -- groups is/are replaced by --O--, --COO-- and/or --OOC-- and/or one --CH.sub.2 --CH.sub.2 -- group can be replaced by --CH.dbd.CH--; with the proviso that at least one of the groups R.sup.1 and R.sup.2 must be chiral, liquid crystalline mixtures which contain these compounds and their use for optical and electro-optical purposes.

REFERENCES:
patent: 4264148 (1981-04-01), Gobl-Wunsch et al.
patent: 4961876 (1990-10-01), Demus et al.
Demus, Flussige Kristalle in Tabellen I, pp. 253-254.
Demus, Flussige Kristalle in Tabellen I, pp. 346-348.
J. de Physique, Colloque C1, supplement au n.sup.o 3, Tome 36, Mars 1975, p. C1-379.
Mol. Cryst. Liq. Cryst., vol. 185, p. 131 (1990).

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