摘要:
The invention relates to optically active compounds represented by the general formula I wherein n, R 1 , R 2 , R 3 , R 4 ., Q 1 , Q 2 , Q 3 , and M are defined as in the specification, methods and intermediates for their preparation, liquid crystal compositions comprising at least one optically active compound of formula I and their use in electrooptical display, switching and modulation devices.