| abstract |
The present invention relates to compounds of the general formula (I), their preparation, liquid crystal mixtures containing such compounds and their use as electro-optic applications:n n n n n n n n Wherein A 1 represents a single covalent bond and A 2 represents 1,4-phenylene or trans-1,4-cyclohexylene; A 1 represents trans-1,4-cyclohexylene and A 2 represents a single covalent bond; X 1 represents fluorine or chlorine, X 2 represents fluorine, or when X 1 represents chlorine, it also represents hydrogen or chlorine, and R 1 represents C2-C12 1E-alkenyl. The compounds according to the invention facilitate low threshold potentials and at the same time short switching times. |