| 摘要 |
Compounds of the formula <IMAGE> I 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 R1 and R2 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. |
