Optically active compounds used for liquid crystalline mixtures

Details Optically active compounds used for liquid crystalline mixtures Optically active compounds used for liquid crystalline mixtures

1992-04-01

1993-10-05

Tucker, Philip

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

568631, 25229961, 25229963, 25229965, 25229967, C09K 1912, C07C 4100

Patent

active

052502228

ABSTRACT:
Optically active compounds of the formula ##STR1## wherein R.sup.1 and R.sup.2 each are alkyl with at least 2 carbon atoms; A.sup.1, A.sup.2 and A.sup.3 each are unsubstituted, cyano-, halogen- or methyl-substituted 1,4-phenylene, optionally having one or two CH groups replaced by nitrogen, unsubstituted, cyano- or methyl-substituted trans-1,4-cyclohexylene, the cyclohexylene optionally having one or two CH.sub.2 groups replaced by oxygen; Z.sup.1 and Z.sup.2 each are a single covalent bond, --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --C.tbd.C--, --COS-- or --SOC--; m stands for the number 0 or 1; n is an integer of 0 to 4; X is oxygen or a methylene group; and each C* represents a chiral carbon atom, one of the chiral carbon atoms has the R-configuration while the other has the S-configuration.
The compounds are used in liquid crystalline mixtures to compensate the temperature dependence of the threshold potential of liquid crystal cells.

REFERENCES:
patent: 4264148 (1981-04-01), Gobl-Wunsch et al.
patent: 4265600 (1987-03-01), Heppke et al.
patent: 4296631 (1981-10-01), Fergason
patent: 4753752 (1988-06-01), Raynes et al.
patent: 4780240 (1988-10-01), Emoto et al.
patent: 4834904 (1989-05-01), Krause et al.
patent: 5064569 (1991-11-01), Geelhaar et al.
Patent Abstract of Japan, vol. 12, No. 459 (C-547) 3297, Nov. 25, 1988, p. 75 C 547 Corresponding to JP application Ser. No. 63-175095.
Patent Abstract of Japan, vol. 13, No. 233 (C-601) 3581, May 29, 1989, p. 81 C 601 Corresponding to JP application Ser. No. 1-42454.
Derwent Abstract 80-05545C/04 corresponds to DE 2827471.

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