摘要:
A hydrofuran-fused calix[4]pyrrole (2) was synthesised from the condensation of pyrrole with acetone (0.75 equiv.) and hydroxyacetone (0.25 equiv.) in the presence of 1.0 equiv. of methanesulphonic acid. In analogy to what was seen with normal calix[4]pyrrole (1), H-1 NMR spectroscopic and isothermal titration calorimetry analyses served to confirm that compound 2 can act as an effective receptor for anions, such as the halides and benzoate. In addition, compound 2 was found to solubilise CsF in chloroform more effectively than calix[4]pyrrole 1, a finding attributed to participation of the oxygen atom of 2 in the caesium cation complexation process.