spectrometry, X-ray crystallographic analyses, and isothermal titration calorimetry. Cryptand 12 exhibits the highest association constant for diquat ever reported (Ka = 1.9 x 10(6) M(-1)) and very high association constants for paraquats (Ka > 10(5) M(-1)) in acetone at 22 degrees C. The binding constant of diquat 4 by cryptand 12 is nearly 6-times higher than any other reported host.
报道了高产率(93%),顺式(4,4')-二(羰基
甲氧基苯并)-30-crown-10(1c)的区域特异性合成。通过与
吡啶-2,6-二羰基
氯反应,将得到的
冠醚二醇1d以44%的产率转化成
吡啶基隐窝分子12。通过(1)1 H NMR光谱,NOE实验,质谱,X射线晶体学研究了两种不同的
4,4'-联吡啶(
百草枯)物种(3)和
2,2'-联吡啶(
敌草快)4 by 12的结合。分析和等温滴定量热法。Cryptand 12在22°C的
丙酮中显示出最高的
百草枯缔合常数(Ka = 1.9 x 10(6)M(-1))和
百草枯的缔合常数非常高(Ka> 10(5)M(-1))。
敌草快12与cryptand 12的结合常数比其他报道的宿主高出近6倍。