| abstract |
Ferroelectric liquid crystal mixture containing at least one optically active compound of the general formula wherein X¹ denotes a single covalent bond, -COO-, -OOC-, -CH₂CH₂-, -OCH₂- or -CH₂O-; one of the rings A¹, A² and A³ represents trans-m-dioxane-2,5-diyl, and the other two of the rings A¹, A² and A³ represent 1,4-phenylene which is unsubstituted or substituted by cyano, halogen or lower alkyl; R¹ and R² independently of one another represent an optionally halogen-substituted alkyl group having up to 18 carbon atoms, in which 1 or 2 non-adjacent CH₂ groups are optionally replaced by -O-, -CO-, -COO- and / or -OOC-, as well as new compounds falling under formula I. |