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Updated: Sep 30, 2025

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
A Dinuclear Metallobridged Super Aryl-Extended Calix[4]pyrrole Cavitand
Qingqing Sun1,2, Luis Escobar1,3, Pablo Ballester4,1
1Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007, Tarragona, Spain.
Abstract:
A super aryl-extended calix[4]pyrrole equipped with four oxazolo[4,5-b]pyrazinyl units at its upper rim is reported. Its PtII /PdII -metallobridged cavitand counterparts were obtained by treatment with 2 equiv of cis-protected metal corners, [M(dppp)(OTf)2 ] (dppp=1,3-(bis-diphenylphosphino)propane). The metal corners arranged their axial phenyl substituents near the aromatic walls of the cavitand leading to the formation of inclusion complexes as single conformers. We characterized the inclusion complexes in solution using NMR spectroscopy. Selected complexes were also characterized in the gas-phase and in the solid-state using mass spectrometry and X-ray diffraction analysis. The dimensions of the open portals of the dinuclear complexes were found to be dependent on the included guest. The results of DFT calculations served to explain the dissimilar complexation-induced shifts observed in the dinuclear inclusion complexes with mono- and bis-formamide guests.
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