Immobilization of Cyclic Alkylamine Calix[4]arene Derivatives on Merrifield Resin: Evaluation of Extraction Ability Toward Dichromate

Two new calix[4]arene‐based polymeric resins were synthesized via nucleophilic substitution reactions involving 5,11,17,23‐tetrakis(N‐piperidinomethyl)‐25,26,27,28‐tetrahydroxycalix[4]arene ( 2 ) and 5,11,17,23‐tetrakis[4‐carboethoxy‐N‐piperidino]‐25,26,27,28‐tetrahydroxycalix[4]arene ( 4 ) as precursors with Merrifield resin. Extraction studies were performed by liquid–liquid extraction and solid–liquid adsorption procedures. The monomeric compounds showed excellent extraction ability toward dichromate in liquid–liquid extraction systems. Polymeric resin 3 with calixarene moieties exhibited high adsorption properties, while resin 5 showed lower adsorption of dichromate in solid–liquid extractions.