Journal
TETRAHEDRON
Volume 60, Issue 47, Pages 10747-10752Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2004.08.098
Keywords
boronic acids; cavitands; resorcinarenes; Langmuir films; molecular recognition; surface pressure; surface potential
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An efficient synthetic route for the synthesis of cavitands derived from calix[4]resorcinarene and its tetrabromo derivative was elaborated. A large-scale preparation was achieved in excellent yield, by replacing the high-boiling solvents with acetone. The tetrabromocavitands were transformed into tetra-boronic acid cavitands via lithiation with butyllithium and reaction with triethylborate. Two lipophilic cavitands bearing four boronic acid residues were demonstrated to form stable Langmuir monolayers at the water-air interface. These cavitand receptors differ in bridging unit between oxygen atoms, i.e. one contains a one-carbon unit and the other a two-carbon unit. L-sorbose, D-galactose, D-glucose, and D-cellobiose were selected for molecular recognition studies using the Langmuir techniques. The unsubstituted tetra-n-undecyl calix[4]resorcinarene was used as a reference receptor compound. Differences in surface potential were diagnostic of the different types of binding forces, which can occur. (C) 2004 Elsevier Ltd. All rights reserved.
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