| 摘要 |
Compounds of the formula: <IMAGE> wherein R is an alkyl, alkoxy, aryl, aryloxy, arylester, carboxy or ester derived from carboxy are used as liquid crystal materials in electro-optical displays. A typical embodiment is 5-butyl-2-(4-cyanophenyl)-1,3-dioxane which has a very low threshold voltage in nematic displays. On rubbed indium oxide surfaces the threshold voltage was 0.6 V using predominately the trans isomer. It was nematic over the range 32.2 DEG C. to 34.6 DEG C.
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