| abstract |
The invention relates to CF 2 O-bridged cyclohexane derivatives, in particular compounds of formula (I), R1-(-A1-Z1-)k1-Q-CF2O-A2-(-Z3-A3-)K3-R2, wherein Q represents group (a); W 1 , W 2 represent —CH 2 — and/or —O— independendy from each other, X 1 , X 2 , X 3 , X 4 represent H, F, —CH 3 —CH 2 F—CH 2 F and/or —CF 3 independently from each other, provided that at least one substituent X 1 , X 2 , X 3 and/or X 4 does not represent H, Z 2 represents a simple bond, —CH 2 —CH 2 — or —CF 2 —CF 2 —, m represents 0 or 1 and R 1 , R 2 , A 1 , A 2 , A 3 , Z 1 , Z 3 , k1 and k3 have the meaning cited in the description. The invention further relates to liquid criystal substances such as optical and electro-optical display elements. |