An acetylene derivative represented by general formula (I): ##STR1## wherein R.sup.1 is saturated or unsaturated alkyl group having 3-20 carbon atoms, R.sup.2 is saturated or unsaturated alkyl group having 1-20 carbon atoms which may optionally be substituted by halogen atom or alkoxyalkyl group having 2-20 carbon atoms, A and B represent phenylene group or the like or taken as --A--B-- represent naphthalene group or the like, m and s are each 0 or 1, n is integer of 1-6, and * means asymmetric carbon atom; a process for producing said acetylene derivative, a liquid crystal composition using the same as active ingredient, and a liquid crystal element using said composition.
一种由一般式(I)表示的
乙炔衍
生物:##STR1##其中,R.sup.1是饱和或不饱和的烷基,其具有3-20个碳原子;R.sup.2是饱和或不饱和的烷基,其具有1-20个碳原子,可以选择性地被卤素原子或具有2-20个碳原子的烷氧基烷基所取代;A和B表示苯基或类似物,或者作为--A--B--表示
萘基或类似物;m和s均为0或1,n是1-6的整数,*表示不对称碳原子;一种制备所述
乙炔衍
生物的方法,一种使用其作为活性成分的液晶组合物,以及使用该组合物的液晶元件。