One-Pot Synthesis of Tweezer-Like Calix[4]resorcinarene Decorated with Pendant Heterocyclic Moieties: An Efficient and Recyclable Heterogeneous PTC for the Preparation of Azidohydrins in Water

Abstract

Direct incorporation of ionic liquid onto the upper rim of calix[4]resorcinarene led to the formation of tweezer-like calix[4]resorcinarene via one-pot strategy. The formation of this cationic supramolecular structure was confirmed by 1H NMR, 13C NMR, CHNS, TGA and DTA techniques. The hydrophobic central cavity and hydrophilic cationic arms render it a suitable heterogeneous phase transfer catalyst for the preparation of valuable azidohydrins in water. The recovered catalyst could be used for several times without any significant loss of activity.