Pyridazines
AssigneeHoffmann-La Roche Inc.
InventorsMartin Schadt, Kuno Schleich, Georg Trickes
Life of this patent
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Abstract
Compounds of the formula ##STR1## wherein R.sup.1 is straight-chain alkyl of 1 to 12 carbon atoms, R.sup.2 is alkyl, alkoxy, p-alkylphenyl, p-alkoxyphenyl or trans-4-alkylcyclohexyl, and the alkyl and alkoxy groups in R.sup.2 each are straight-chain groups of 1 to 10 carbon atoms, their manufacture, liquid crystalline mixtures containing said compounds as well as their use for electro-optical purposes are described. The novel compounds are valuable components for liquid crystalline mixtures and have a negative dielectric anisotropy.
Claims18
A compound of the formula ##STR24## wherein R.sup.1 is straight-chain alkyl of 1 to 12 carbon atoms, R.sup.2 is alkyl, alkoxy, p-alkylphenyl, p-alkoxyphenyl or trans-4-alkylcyclohexyl, and said alkyl and alkoxy groups in R.sup.2 each are straight-chain groups of 1 to 10 carbon atoms.
A liquid crystal mixture comprising a compound of the formula ##STR25## wherein R.sup.1 is straight-chain alkyl of 1 to 12 carbon atoms, R.sup.2 is alkyl, alkoxy, p-alkylphenyl, p-alkoxyphenyl or trans-4-alkylcyclohexyl, and said alkyl and alkoxy groups in R.sup.2 each are straight-chain groups or 1 to 10 carbon atoms.
An electro-optical cell having two plate means at least one plate means being transparent;
- means for controlling the optical activity of the cell;
- and liquid crystal means including a compound of the formula ##STR34## wherein R.sup.1 is straight-chain alkyl of 1 to 12 carbon atoms, R.sup.2 is alkyl, alkoxy, p-alkylphenyl, p-alkoxyphenyl or trans-4-alkylcyclohexyl, and said alkyl and alkoxy groups in R.sup.2 each are straight-chain groups of 1 to 10 carbon atoms.
Dependencies are inferred from the claim text.