On the Importance of the Nature of Hydrogen Bond Donors in Multiple Hydrogen Bond Systems
作者:Jörg Taubitz、Ulrich Lüning
DOI:10.1002/ejoc.200800589
日期:2008.12
Association constants for the reaction between a fourfold hydrogen bond receptor 4 possessing an AADA hydrogen bond pattern and several complementary partners 5–7 with DDAD and DDA patterns have been determined by NMR titration and by isothermal titration calorimetry (ITC). A variation of one donor site in the DDAD pattern resulted in the following, surprising sequence of stability of the complexes:
具有 AADA 氢键模式的四重氢键受体 4 与具有 DDAD 和 DDA 模式的几个互补伙伴 5-7 之间反应的关联常数已通过 NMR 滴定和等温滴定量热法 (ITC) 确定。DDAD 模式中一个供体位点的变化导致复合物的以下令人惊讶的稳定性序列:KAss(6, X = NHCOR) > KAss(7, X = H) > KAss(5, X = NHR)。描述了一种易溶的 DDAD 受体,即具有三甘醇链的酰胺吡啶基脲 6b 的合成。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)