Optically active methyl dioxanes

Details Optically active methyl dioxanes Optically active methyl dioxanes

1995-01-12

1996-05-21

Geist, Gary L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

549369, C09K 1934, C07D31906

Patent

active

055186530

ABSTRACT:
Optically active compounds of the formula ##STR1## wherein n stands for the number 0 or 1; Z.sup.1 is a single covalent bond or --CH.sub.2 CH.sub.2 --; Z.sup.2 is a single covalent bond, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --COO-- or --OOC--; rings A.sup.1 and A.sup.2 each independently represent trans-1,4-cyclohexylene or optionally halogen-, cyano- and/or methyl-substituted 1,4-phenylene in which optionally 1 CH group or 2 CH groups is/are replaced by nitrogen; R.sup.2 is a group R.sup.4 or a group of the formula ##STR2## R.sup.4 is cyano, halogen, --OCY.sup.1 F.sub.2, --CY.sup.1 F.sub.2 or an alkyl group in which optionally one >CH--CH< is replaced by >C.dbd.C< and/or optionally one methylene group or two non-adjacent methylene groups is/are replaced by --O--, --COO-- and/or --OOC-- and/or optionally one methylene group is replaced by --CHY.sup.2 --; Y.sup.1 is hydrogen or fluorine; Y.sup.2 is halogen, cyano or methyl; R.sup.1 and R.sup.3 denote alkyl in which optionally one >CH--CH< is replaced by >C.dbd.C< and/or optionally one methylene group or two non-adjacent methylene groups is/are replaced by --O-- and/or optionally one or more hydrogen atoms is/are replaced by fluorine; and (S*) and (R*) denote the relative configurations of the chiral carbon atoms,
as well as liquid crystalline mixtures which contain such compounds and their use for optical and electro-optic purposes.

REFERENCES:
patent: 4264148 (1981-04-01), Gobl-Wunsch et al.
patent: 4676604 (1987-06-01), Petrzilka
patent: 4704227 (1987-11-01), Krause et al.
patent: 4726911 (1988-02-01), Krause et al.
patent: 4755323 (1988-07-01), Eidenschink et al.
patent: 4770503 (1988-09-01), Buchecker et al.
patent: 5013476 (1991-05-01), Boller et al.
Derwent Abstract of EP 257,049 No. 87-250188/35.
Derwent Abstract of DE 3,437,935 No. 86-113699118.

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