Compounds of the formula ##STR1## wherein when X is nitrogen, Y and Z are --CH--; or when Y is nitrogen, X and Z are --CH--; or when Z is nitrogen, X and Y are --CH--; and one of R.sub.1 and R.sub.2 is cyano and the other is straight-chain alkyl of 1 to 7 carbon atoms, straight-chain alkoxy of 1 to 7 carbon atoms or straight-chain alkanoyloxy of 2 to 7 carbon atoms, Prepared by a variety of methods, are described. The compounds of the invention are useful as components of nematic mixtures.
本发明涉及一种式为##
STR1##的化合物,其中当X为
氮时,Y和Z为--CH--; 或当Y为
氮时,X和Z为--CH--; 或当Z为
氮时,X和Y为--CH--; 并且R.sub.1和R.sub.2中的一个为
氰基,另一个为1至7
碳原子的直链烷基,1至7
碳原子的直链烷
氧基或2至7
碳原子的直链烷酰
氧基。本发明通过多种方法制备。本发明的化合物可用作向列相混合物的组分。