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Title
Selective Synthesis of Two Constitutionally Isomeric Oriented Calix[6]arene-Based RotaxanesThis research was partly supported by MIUR (Supramolecular Devices Project) and FIRB (Manipolazione Molecolare per Macchine Nanometriche). We thank the Centro Interdipartimentale di Misure “G. Casnati” for NMR measurements.