An approach to calix[6]cryptands with bridgehead carbon atom: Stabilized in- and out- stereoisomers
作者:Yuanyin Chen、Jiansen Li、Zhenlin Zhong、Xueran Lu
DOI:10.1016/s0040-4020(98)00963-6
日期:1998.12
A new approach to cap 1,3,5-trimethyloxy-p-tert-butyl calix[6]arene with 1,1,1-tri(tosyloxyethoxyethoxymethyl)propane to form a pair of separable stabilized in- and out- calix[6]cryptands was reported. After heating 5a or 5b at 280°C, the interconversion between them was not detected by TLC, which provides a direct and non-spectral methodology to obtain unambiguous evidence for the ring immobilization
的新方法帽1,3,5- trimethyloxy- p -叔丁基杯[6] 1,1,1-三(tosyloxyethoxyethoxymethyl)丙烷芳烃以形成一对可分离的稳定输入和OUT-杯[6的报告了] cryptands。在280°C下加热5a或5b后,TLC并未检测到它们之间的相互转化,这提供了直接和非光谱的方法来获得明确的证据,证明杯状芳烃[6]芳烃具有立体异构体的环固定化。