abstract |
Optically active dopants of the formula ##STR1## wherein C* denotes a chiral carbon atom and R 1 signifies C 2 -C 12 -alkyl, C 2 -C 12 -alkenyl, C 2 -C 12 -alkoxycarbonyl or C 3 -C 12 -alkenyloxycarbonyl, their manufacture, liquid crystalline mixtures which contain such dopants and their use for optical or electro-optical purposes. |