The present invention relates to benzo[f]chromene and pyrano[3,2-f]-chromene derivatives of the formula I
in which
L
1
, L
2
, R
1
, R
2
, A
1
, A
2
, Z
1
, Z
2
, m and n are as defined in claim
1,
to the preparation thereof, to the use thereof as components in liquid-crystalline media, and to electro-optical display elements which contain the liquid-crystalline media according to the invention.
本发明涉及公式I中的苯并[f]色烯和
吡喃[3,2-f]-色烯衍
生物,其中L1、
L2、R1、R2、A1、A2、Z1、Z2、m和n的定义如权利要求1中所述,其制备方法,其作为液晶介质中的组分的用途,以及包含根据本发明含有液晶介质的电光显示元件。