Naphthalenophane formaldehyde acetals as candidate structures for the generation of dynamic libraries via transacetalation processes
作者:Albert Ruggi、Roberta Cacciapaglia、Stefano Di Stefano、Enrico Bodo、Franco Ugozzoli
DOI:10.1016/j.tet.2013.01.080
日期:2013.4
(K≈105 M−1 for association of the guanidinium ion with C3 in chloroform). A library of macrocycles was generated by acid catalyzed transacetalation of Cn in chloroform, but the dynamic nature of the system was spoiled by the occurrence of irreversible reactionpathways promoted by the relatively easy formation of extended benzyl-like carbocations I.
降低环状低聚物Ç 2 - c ^ 5家族naphthalenophane甲醛的缩醛Ç Ñ已被分离和表征,在两种阻转异构的形式而获得的二聚物,顺式- c ^ 2和抗- c ^ 2,通过X射线分析证实。所研究的环芳表明向贫电子客人有趣的识别属性(ķ ≈10 5 中号-1用于与胍离子的缔合Ç 3的氯仿溶液)。通过酸催化的乙缩醛缩醛化生成大环库C n在氯仿中,但是由于不可逆的反应路径的发生而破坏了该系统的动力学性质,该反应路径是由相对容易形成的延长的苄基状碳正离子I促进的。