Calix[6]azacryptand Ligand with a Sterically Protected Tren-Based Coordination Site for Metal Ions

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• 作者：Sara Zahim ; Lasantha A. Wickramasinghe ; Gwilherm Evano ; Ivan Jabin ; Richard R. Schrock ; Peter Müller
• 刊名：Organic Letters
• 出版年：2016
• 出版时间：April 1, 2016
• 年：2016
• 卷：18
• 期：7
• 页码：1570-1573
• 全文大小：285K
• ISSN：1523-7052

文摘

A new calix[6]azacryptand ligand has been prepared in six steps starting from 1,3,5-trismethoxycalix[6]arene. An X-ray study shows that this ligand has a sterically protected tren-based binding site at the bottom of a polyaromatic bowl and ether sites around its rim. It binds Zn²⁺ to give a complex in which zinc is in a trigonal bipyramidal geometry with a water bound in one apical position and two additional hydrogen-bonded waters that fill the calixarene cavity.