| 摘要 |
The present invention is concerned with novel chlorophenylalkoxyalkyl compounds of the general formula <IMAGE> I wherein R denotes an alkyl residue with 1 to 12 carbon atoms; n is a whole number of 2 to 7, ring A denotes trans-1,4-cyclohexylene or 1,4-phenylene; m is either 0 or 1; ring B is trans-1,4-cyclohexylene, 1,4-phenylene in which optionally one CH group or two non-adjacent CH groups is/are replaced by nitrogen or, when m stands for 1, also trans-1,3-dioxane-2,5-diyl; Y1 and Y2 each independently represent a single covalent bond or -CH2CH2-; and X denotes hydrogen, fluorine or chlorine, their manufacture, liquid crystalline mixtures which contain these compounds, their production and use for electro-optical purposes.
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