Phenylcyclohexanes and a liquid-crystalline medium

摘要

Novel phenylcyclohexanes of the formula I in which n is 0 to 7, Q¹ and Q² are H, or one of these radicals is alternatively CH₃, r is 0, 1, 2, 3, 4 or 5, A is trans-1,4-cyclohexylene, 1,4-phenylene, 3-fluoro-1,4-phenylene or a single bond, X is F, Cl, -CF₃, -CN, -OCF₃ or -OCHF₂, and Y and Z are each, independently of one another, H or F, with the proviso that, in the case where A is a single bond, Q¹=Q²=H and simultaneously X=CN, Y and/or Z are F.