| abstract |
The invention relates to compounds of formula (I), wherein a, b, c, d, e, R 1 , R 2 , A 1 , A 2 , A 3 , A 4 , Y 1 , Y 2 , Y 3 , Z 1 , Z 2 , Z 3 , Z 4 and are such as defined in claim 1 , to a method for the production thereof, intermediates for the production and the thereof in the form of components in liquid crystalline media and to electrooptic display elements containing said liquid crystalline media. |