Abstract
Five new multivalent ligands based on either p-tert-butylthiacalix[4]arene (TCA) 1 or p-tert-butylcalix[4]arene (CA) 2 backbones in 1,3-Alternate conformation bearing four oxamate coordinating groups at their lower rim were designed and synthesized by a multistep strategy. These ligands differ either by the nature of the calix[4]arene backbone (CA or TCA) or by the nature of the spacer ((CH2)n) connecting the oxamate binding units to the backbone.
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