The ligand X4Me2Imme2 was synthesized from p-tert-butylcalix[4]arene. Upon reaction with one equivalent of Cu(NCMe)4PF6, it led to the new two-coordinate copper(I) complex [Cu(X4Me2Imme2)]PF6 that was characterized by X-ray diffraction analysis. This complex revealed itself to be totally inert towards dioxygen in the solid state as well as in coordinating or protic solvents.
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Clainche et al. (2000) studied this question.
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