Pyridazines
AssigneeHoffmann-La Roche Inc.
InventorMartin Petrzilka
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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 1-alkynyl and the 1-alkynyl group in R.sup.2 is a straight-chain group 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.
Claims15
A compound of the formula ##STR25## wherein R.sup.1 is straight-chain alkyl of 1 to 12 carbon atoms, R.sup.2 is 1-alkynyl and said 1-alkynyl group in R.sup.2 is a straight-chain group of 2 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 ##STR26## wherein R.sup.1 is straight-chain alkyl of 1 to 12 carbon atoms, R.sup.2 is 1-alkynyl and said 1-alkynyl group in R.sup.2 is a straight-chain group of 2 to 10 carbon atoms.
A liquid crystal mixture comprising a compound of the formula ##STR27## wherein R.sup.1 is straight-chain alkyl of 1 to 12 carbon atoms, R.sup.2 is 1-alkynyl and said 1-alkynyl group in R.sup.2 is a straight-chain group of 2 to 10 carbon atoms.
Dependencies are inferred from the claim text.