Synthesis and topology of [2+2] calix[4]resorcarene-based chiral cavitand-salen macrocycles |
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| Authors: | Andrea Pappalardo Maria E. Amato Francesco P. Ballistreri Anna Notti Gaetano A. Tomaselli Rosa M. Toscano Giuseppe Trusso Sfrazzetto |
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| Affiliation: | 1. Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy;2. Dipartimento di Chimica Organica e Biologica, Università di Messina, Viale F. Stagno d’Alcontres 31, 98166 Messina, Italy |
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| Abstract: | Chiral diastereomeric cavitand-salen macrocycles have been synthesized by the high-dilution condensation of a tris-(quinoxaline-bridged)-diformyl-calix[4]resorcarene with (1R,2R)-diphenylethylenediamine. The reaction produced a couple of diastereoisomers, consisting of two cavitand cavities bis-bridged by two chiral diimino moieties, which differ in a convergent (C-shaped) or divergent (S-shaped) orientation of the two cavities. |
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