Novel C2-symmetric chiral 18-crown-6 derivatives with two aromatic sidearms 2–4 were prepared, and their enantiomericrecognition abilities as chiral NMR discriminating agents towards primary ammoniumsalts were examined. Among these chiralcrownethers, the most effective enantiomeric discrimination of racemic ammoniumsalts in the 1H NMR spectra was attained by the derivative with two pyrenylmethyl
新颖Ç 2 -对称的手性18-冠-6与两个芳腰佩衍生物2 - 4进行了检查,制备,以及它们的对映体识别能力作为对初级铵盐手性NMR鉴别试剂。在这些手性冠醚中,具有两个pyr烯基甲基侧臂的衍生物获得了1 H NMR光谱中外消旋铵盐最有效的对映异构体鉴别。