The 1,3-bis(trimethylsilyl) ether of p-tert-butylcalix[4]arene, [Butcalix(TMS)2]H2, has been synthesized and used as a dianionic ligand for Ge and Sn; notably, the Ge complex [Butcalix(TMS)2]Ge exhibits exo/endo isomerism, and provides the first calixarene system for which both isomers have been structurally characterized.
T. Hascall, G. Parkin, T. Hascall, A. L. Rheingold and I. Guzei, Chem. Commun., 1998, 101 DOI: 10.1039/A705937J
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