determination of the association constants (Ka) was afforded. The crucial role played by the ammonium counter-ion in the threading process was further demonstrated as salts of TRISPHAT (tris(tetrachlorobenzenediolato)phosphate(V)) anion were quite more effective than their PF6- analogues (x 7.3). A general lack of diastereoselectivity (de
本文报道了对固有手性假轮烷的立体选择性合成的研究。可以从五个正二价正丙基-1,13-二甲氧基喹ac啶鎓阳离子的外消旋或对映纯(M或P)盐制备手性
铵线。它们与DB24C8或双对称取向的DB24C8F6环的自组装形成假轮烷,如1H和19F NMR光谱以及MS测量所示。确定了缔合常数(Ka)。
铵抗衡离子在穿线过程中发挥了至关重要的作用,这进一步证明了TRI
SPHAT(三(四
氯苯二醇基)
磷酸(V))阴离子的盐比其PF6-类似物(x 7.3)更有效。一般缺乏非对映选择性(de