Cyclohexane compounds used in liquid crystalline mixtures

Details Cyclohexane compounds used in liquid crystalline mixtures Cyclohexane compounds used in liquid crystalline mixtures

1993-12-13

1994-09-13

Wu, Shean

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229961, 25229962, 544242, 544298, 544335, 546192, 546251, 359103, C09K 1930, C09K 1934, C07D23902

Patent

active

053466470

ABSTRACT:
Compounds of the formula ##STR1## wherein n stands for the number 0 or 1; R.sup.1 denotes a group R.sup.3 or R.sup.3 --A.sup.3 --Z.sup.2 -- and R.sup.2 denotes a group R.sup.4 or R.sup.4 --A.sup.4 --Z.sup.3 --; ring A.sup.1 is unsubstituted or halogen-, cyano- and/or methylsubstituted 1,4-phenylene in which optionally 1 CH group or 2 CH groups is/are replaced by nitrogen; A.sup.3 A.sup.4 and ring A.sup.2 each independently represent 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 or trans-1,4-cyclohexylene, trans-1,3-dioxane-2,5-diyl, 1-cyano-trans-1,4-cyclohexylene, bicyclo[2.2.2]octane- -1,4-diyl, naphthalene-2,6-diyl, tetralin-2,6-diyl or trans-decalin-2,6- diyl; Z.sup.1, Z.sup.2 and Z.sup.3 each independently are a single covalent bond, --COO--, --OOC--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --C.vertline.C--, --(CH.sub.2).sub.3 O--, --O(CH.sub.2).sub.3 --, --(CH.sub.2).sub.4 -- or the trans form of --CH.dbd.CH-- CH.sub.2 O-- or --OCH.sub.2 --CH.dbd.CH--; R.sup.3 and R.sup.4 each independently denote halogen, cyano, --NCS, --CF.sub.3, --OCF.sub.3 or 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--, --COO-- and/or --OOC-- and/or optionally one methylene group is replaced by --CHX--; and X is halogen, cyano or methyl, as well as liquid crystalline mixtures which contain such compounds and their use for electro-optical purposes.

REFERENCES:
patent: 4035056 (1977-07-01), Coates et al.
patent: 4627933 (1986-12-01), Eidenschink et al.
patent: 4676604 (1987-06-01), Petrzilka
patent: 4713197 (1987-12-01), Eidenschink et al.
patent: 4886620 (1989-12-01), Hopf et al.
patent: 4894181 (1990-01-01), Praefcke et al.
patent: 4943384 (1990-07-01), Sucrow et al.
patent: 5238600 (1993-08-01), Kelly
Poetsch, Kontakte (Darmstadt) 2, 15-28 (1988).

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