Synthesis of a New Heteropolytopic Cryptand Through Schiff Base Condensation in the Presence of Ba(II) Ion

Abstract

A new Schiff base cryptand (L) has been prepared via [2 + 2] condensation of 1,3,5-tris(2-formylphenoxymethyl)benzene (1) with 1,3,5-tris(aminomethyl)benzene trishydrochloride (2) in the presence of Ba(II) ion. The analytical data show that the Ba(II) cation is not retained by the product. Thus it seems that the role of the Ba(II) ion is to organize the transition state preceding the formation of the cryptand.

Keywords:

• Barium(II) ion
• cryptand
• Schiff base
• template

ACKNOWLEDGMENTS

We are grateful to the Faculty of Chemistry of Bu-Ali Sina University, Ministry of Science, Research, and Technology of Iran, for financial support. The authors thank Prof. Michael D. Ward (Department of Chemistry, University of Sheffield, Sheffield, UK) for his invaluable support in recording the FAB mass spectrum.