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US 5,180,521 AGranted
Chiral compounds
AssigneeMerck Patent Gesellschaft mit beschraenkter Haftung
InventorsRudolf Eidenschink, Reinhard Hopf, Eike Poetsch
Life of this patent
Estimating the term…
Abstract
Optically active compounds of the formula I can be used as components of chiral tilted smectic liquid crystal phases.
Claims20
An optically active compound of the formula Ii
- R.sup.1 -A-Z.sup.1 -A.sup.2 -A.sup.3 -R.sup.3 (Ii)
- wherein
- R.sup.1 is H or alkyl of 1-12 C atoms;
- A is 1,4-cyclohexylene containing an asymmetric carbon atom and substituted in the 2-, or 3 position by alkyl of 1-10 C atoms and in the 1- or 4-position by nitrile;
- A.sup.2 and A.sup.3 are each independently (a) 1,4-cyclohexylene;
- or (b) 1,4-phenylene which is unsubstituted or substituted by one or two F atoms, and wherein in each case one or two CH groups can be replaced by N;
- Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O-- or a single bond;
- and
- R.sup.3 is F, Cl, Br, Cn or alkyl of 1-12 C atoms, wherein one or two nonadjacent CH.sub.2 groups can also be replaced by O atoms and/or --CO--O--groups and/or --CH.dbd.CH--groups.
6 more elements
A compound according to claim, wherein group A is substituted in the para-position, relative to R.sup.1, by said nitrile.
A chiral tilted smectic liquid crystal medium containing at least two liquid crystal components, wherein at least one compound is an optically active compound of the Formula Ii
- R.sup.1 -A-Z.sup.1 -A.sup.2 -A.sup.3 -R.sup.3 (Ii)
- wherein
- R.sup.1 is H or alkyl or 1-12 C atoms;
- A is 1,4-cyclohexylene containing an asymmetric carbon atom and substituted in the 2-, or 3 position by alkyl of 1-10 C atoms and in the 1- or 4-position by nitrile;
- A.sup.2 and A.sup.3 are each independently (a) 1,4-cyclohexylene or (b) 1,4-phenylene which is unsubstituted or substituted by one or two F atoms and wherein, in each case, one or two CH groups can be replaced by N;
- Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, or a single bond;
- and
- R.sup.3 is F, Cl, Br, CN, or alkyl or 1-12 C atoms, wherein one or two nonadjacent CH.sub.2 groups can also be replaced by O atoms and/or --CO--O-- groups and/or --CH.dbd.CH-- groups.
5 more elements
Dependencies are inferred from the claim text.