The invention relates to nematic liquid crystals, especially for electro-optical components for the modulation of transmitted or reflected light, as well as for the display of numbers, symbols and images, exhibiting favorable physical characteristics, as well as to a method for the production of the new substances. It has been found that new liquid crystal 2-substituted-1,3-dioxane-5-carboxylic acid esters of the general formula ##STR1## are suited for use in electro-optical components for the modulation of the light, as well as for the display of numbers, symbols and images, and can be used alone, in mixtures with each other and/or in mixtures with additional liquid crystal or non-liquid crystal substances. In the method for the production of the new liquid crystal trans-2-substituted-1,3-dioxane-5-carboxylic acid esters, 2-substituted-1,3-dioxane carboxylic acids, with halogen donors such as thionyl chloride, sulfuryl chloride or phosphoric halides, preferably in the absence of organic bases, are converted into the corresponding acid chlorides, which are subsequently esterified in well-known fashion with alcohols or substituted phenols.
该发明涉及向列型液晶,特别是用于调制透射或反射光的电光组件,以及用于显示数字、符号和图像的电光组件,具有有利的物理特性,以及一种用于生产新物质的方法。已发现新的液晶2-取代-1,3-二氧杂
环戊酸酯具有一般式##STR1##适用于用于调制光的电光组件,以及用于显示数字、符号和图像,并且可以单独使用,与彼此混合和/或与额外的液晶或非液晶物质混合使用。在生产新液晶反式-2-取代-1,3-二氧杂
环戊酸酯的方法中,2-取代-1,3-二氧杂
环戊酸与卤素供体(如亚
硫酰氯、
氯化亚
硫酰或
磷卤化物),最好在
无机碱的情况下,转化为相应的酸
氯化物,然后以众所周知的方式与醇或取代
苯酚酯化。