中文摘要：

代替的 -diketonate 2,4-dioxo-3-pentyl 4-[4-(n-octyloxy ) cinnamoyl ] oxybenzoate 1 并且它的 pyrazole 和 isoxazole 衍生物(2 和 3 分别地) 被分光镜的方法和元素的分析综合了并且描绘。这些混合物的 mesogenic 性质被极化学习了光显微镜学(POM ) 和微分扫描热量测定(DSC ) 。monotropic nematic mesophase 为 -diketonate 被观察 1，相反 2 显示的 pyrazole 3 展出的二形互变的近晶的 A 和 isoxazole 二形互变的 nematic mesophase。在结构和液体之间的关系水晶的性质也被讨论了。

英文摘要：

The γ-substituted β-diketonate 2,4-dioxo-3-pentyl 4-[4-（n-octyloxy）cinnamoyl]oxybenzoate 1 and its pyrazole and isoxazole derivatives （2 and 3 respectively） have been synthesized and characterized by the spectroscopic methods and elemental analysis. The mesogenic properties of these compounds have been studied by polarizing optical microscopy （POM） and differential scanning calorimetry （DSC）. A monotropic nematic mesophase was observed for the β-diketonate 1, in contrast, the pyrazole 2 displays an enantiotropic smectic A and isoxazole 3 exhibits an enantiotropic nematic mesophase. The relationship between the structure and liquid crystalline properties has also been discussed.