| abstract |
The invention relates to new piperidine derivatives <IMAGE> wherein R¹ and R² are each alkyl or alkoxy, each having 1-10 C atoms, -Y-Zm, F, Cl, Br, CN, the rest R¹ also H, Y -CO-O, -O-CO or a single bond, Z -Q-R³ or alkyl with 1-10 C atoms, Q 1,4-phenylene or 1,4-cyclohexylene, R³ alkyl with 1-10 C atoms, F or CN, and A is 1,4-cyclohexylene or 1,3-dioxane-2,5-diyl, and their acid addition salts, which can be used as constituents of dielectrics for electro-optical display elements. |