| abstract |
Six-membered ring compounds of the formula I <IMAGE> I wherein A is a benzene or cyclohexane ring, X1 to X6 independently of one another in each case are H, -OR, -COOR, -SR, -SOR, -SO2R or, if A is a cyclohexane ring, also -O-COR, and R is in each case an alkyl group which has up to 15 C atoms and in which one or two CH2 groups can be replaced by O atoms, at least three of the substituents X1 to X6 being other than H, can be used as constituents of discotic liquid-crystal phases for liquid-crystal display elements. |