Hoffmann-la Roche Inc.

Georg Trickes

Martin Schadt

Martin Petrzilka

Kuno Schleich

Compounds of the formula ##STR1## wherein B is --C.tbd.C-- or --CH.sub.2 CH.sub.2 --, R.sup.1 is straight-chain C.sub.1 -C.sub.12 -alkyl and R.sup.2 is straight-chain C.sub.1 -C.sub.12 -alkyl or straight-chain C.sub.1 -C.sub.12 -alkoxy, their manufacture and use in liquid crystalline mixtures are described.

Pyridazine derivatives useful as components of liquid crystal mixtures

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.

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Grenzach-Wyhlen, Germany

Georg Trickes