protocol for the construction of [2]rotaxanes: "threading-followed-by-shrinking". This approach involves the threading of a rodlike unit through a crown ether-like macrocycle and then shrinking the size of the macrocycle's cavity through coordination of a transition-metal ion by a salophen moiety in the macrocycle. The self-assembly of the macrocycle and a thread, followed by addition of palladium acetate
该通讯描述了一种用于构建 [2] 轮烷的新协议:“线程紧随收缩”。这种方法涉及将棒状单元穿过冠醚类大环,然后通过大环中的 salophen 部分与过渡金属离子的配位来缩小大环腔的尺寸。大环和线的自组装,然后添加乙酸钯,在反离子交换后得到 [2] 轮烷,其中包含钯 (II)-salophen 部分。该 [2] 轮烷通过 NMR 和 IR 光谱、质谱以及元素和 X 射线晶体学分析进行了充分表征。