derivatives. These new macrocycles have been showed to be strong complexing agents for primary organic ammonium salts (with K up to 4.83×105 M−1 and −ΔG0 up to 32.4 kJ mol−1) and also useful chromophores for UV–vis titration studies. These macrocyclic hosts exhibited enantioselective binding towards the (S)-enantiomer of phenylglycine methyl ester hydrochloride (Am1) with K(S)/K(R) up to 2.10 (ΔΔG0=−1.84 kJ mol−1)
一系列新的c ^ 2 -对称
2,2'-联吡啶contaning冠大环化合物1 - 4已被开发用于对映体识别
氨基酸衍
生物。这些新的大环化合物已被证实是对初级有机
铵盐强络合剂(与ķ高达4.83×10 5 中号-1和-Δ ģ 0到32.4千焦摩尔-1),并且还用于UV-VIS滴定有用的发色团学习。这些大环主机表现出的对映选择性朝向(结合小号)
苯基甘氨酸甲酯盐酸盐(对映体
AM1)与ķ (小号) / ķ ([R )高达2.10(ΔΔ ģ 0 = -1.84千焦耳摩尔-1)在CH 2
氯2用0.25%CH 3 OH。结构-结合关系研究表明,
铵客体的芳族亚基和酯基对良好的对映选择性都非常重要。此外,已经使用各种NMR实验研究了主客体复合物。