Benzonitriles
AssigneeHoffmann-La Roche Inc.
InventorsMartin Petrzilka, Alois Villiger
Life of this patent
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Abstract
Compounds of the formula: ##STR1## wherein one of X.sup.1 and X.sup.2 is --CH.sub.2 CH.sub.2 -- and the other is --CH.sub.2 CH.sub.2 -- or a single covalent bond, ring A is 1,4-phenylene or trans-1,4-cyclohexylene, and R.sup.1 is straight-chain C.sub.1 -C.sub.12 -alkyl or when positioned on a 1,4-phenylene ring R.sup.1 may also be straight chain C.sub.1 -C.sub.12 -alkoxy.
Claims6
A compound of the formula ##STR8## wherein ring A is 1,4-phenylene or trans-1,4-cyclohexylene, and
- R.sup.1 is straight-chain C.sub.1 -C.sub.12 -alkyl or when positioned on a 1,4-phenylene ring R.sup.1 may also be straight chain C.sub.1 -C.sub.12 -alkoxy.
A liquid crystalline mixture comprising at least two components, at least one of said components is a compound of the formula:
- ##STR9## wherein ring A is 1,4-phenylene or trans-1,4-cyclohexylene, and
- R.sup.1 is straight-chain C.sub.1 -C.sub.12 alkyl or when positioned on a 1,4-phenylene ring R.sup.1 may also be straight-chain C.sub.1 -C.sub.12 -alkoxy.
An electro optical cell comprising:
- (a) two plate means;
- (b) a liquid crystal means disposed between the two plate means and including a compound of the formula:
- ##STR10## wherein ring A is 1,4-phenylene or trans-1,4-cyclohexylene, and
- R.sup.1 is straight chain C.sub.1 -C.sub.12 -alkyl or when positioned on a 1,4-phenylene ring R.sup.1 may also be straight chain C.sub.1 -C.sub.12 -alkoxy;
- and
- (c) means for applying an electrical potential to said plate means.
Dependencies are inferred from the claim text.