- Optically active tolanes
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A chiral dopant of the formula STR1 wherein ring A is 1,4-phenylene which is optionally substituted with one or more fluorine atoms, chlorine atoms, bromine atoms, cyano groups, or methyl groups, and in which one or two CH groups can be replaced by nitrog
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- Acetylenes
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Compounds of the formula STR1 wherein ring B stands for 1,4-phenylene or a trans-1,4-disubstituted cyclohexane ring and A stands for a group with 1 to 3 six-membered rings, which together with ring B represents a central group of formulae II-XIII; R1 signifies a straight-chain alkyl group containing 1 to 9 carbon atoms or when R1 is attached to a benzene, monofluorinated benzene or pyrimidine, ring R1 also signifies a straight-chain alkoxy group with 1 to 9 carbon atoms; and R2 signifies hydrogen, cyano or a straight-chain alkyl group containing 1 to 7 carbon atoms, their manufacture, liquid crystalline mixtures which contain said compounds and their use for electro-optical purposes are described. The compounds of formula I are especially valuable as components in liquid crystal mixtures and for the most part themselves have liquid crystalline properties.
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