Liquid crystalline mixtures having a chiral tilted smectic phase

Details Liquid crystalline mixtures having a chiral tilted smectic phase Liquid crystalline mixtures having a chiral tilted smectic phase

1992-06-11

1993-09-14

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229961, 25229966, 25229967, 359103, 544242, 544298, 544335, 546290, 546340, 546346, C09K 1930, C09K 1934, C07D23902, C07D21172

Patent

active

052445976

ABSTRACT:
Optically active compounds of the formula ##STR1## wherein m stands for the number 1 and R.sup.2 is an unsubstituted or halogen-substituted alkyl or alkenyl group in which optionally one methylene group is replaced by oxygen and/or optionally one methylene group is replaced by an ester group --COO-- or --OOC--; or m stands for the number 0 or 1 and R.sup.2 denotes a group of the formula ##STR2## R.sup.1 and R.sup.3 each independently represent an alkyl or alkenyl group in which optionally one methylene group is replaced by oxygen; Z.sup.1, Z.sup.2 and Z.sup.3 each independently are a single covalent bond, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --COO-- or --OOC--; n stands for the number 0 or 1; rings A.sup.1 an A.sup.2 each independently are unsubstituted or halogen, cyano and/or methyl-substituted 1,4-phenylene in which optionally 1 CH group or 2 CH groups is/are replaced by nitrogen; and C* denotes a chiral carbon atom; with the proviso that simultaneously R.sup.1 does not are an alkyl group, m and n do not are the number 1, Z.sup.1 does not are the group --CH.sub.2 CH.sub.2 -- or --CH.sub.2 O-- and ring A.sup.1, Z.sup.2, ring A.sup.2 and R.sup.2 together do not are 4-(5-alkyl-2-pyrimidinyl)-phenyl, their preparation, liquid crystalline mixtures which contain these compounds and their use for electro-optical purposes.

REFERENCES:
patent: 4592858 (1986-06-01), Higuchi et al.
patent: 4723005 (1988-02-01), Huynh-Ba et al.
patent: 4753752 (1988-06-01), Raynes et al.
patent: 4855429 (1989-08-01), Heppke et al.
patent: 4867903 (1990-09-01), Nohira et al.
patent: 4873018 (1989-10-01), Nohira et al.
patent: 4961876 (1990-10-01), Demus et al.
patent: 5100577 (1992-03-01), Buchecker et al.
"Some New .alpha.-Fluoro Incorporating a Cyclohexane Ring as Chiral Dopants for Ferroelectric Mixtures", Buchecker et al. Liquid Crystals, vol. 8, No. 2, pp. 217-227, 1990.
"Induced Smectic C* Phase Concentration Dependence of the Ferroelectric Properties and the Effect of a Local Field", Stegemeyer et al. Liquid Crystals, vol. 3, pp. 295-310, 1991.

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