Synthesis, characterisation and metal complexation reactions of two calix[4]arene derivatives functionalised with pendant benzamide arms

Two calix[4]arene derivatives (3 and 4) functionalised at the lower rim with pendant benzamide arms were successfully synthesised and characterised, with the X-ray crystal structure of 3 being determined. Only 4 took part in some metal ion complexation reactions, namely those involving metal(II) acetate salts, with metals salts containing other anions not being complexed.