abstract |
The present invention relates to chroman derivatives of the general formulas (Ia) and (IIa) in which R1, R2, A1, A2, Z, Z2, L1, L2, L3, L4, m and n have the meanings given in claim 1, processes for their preparation, their use as component (s) in liquid-crystalline media and liquid-crystal media and electro-optical display elements containing the liquid-crystalline media of the invention. |