Abstract
AbstractThe synthesis of the A,D‐m‐xylylene‐bridged B,C,E,F‐tetra‐O‐alkylcalix[6]arenes 1b–c and the A,D‐B,C;E,F‐triply bridged calix[6]arenes 2a–c is described. The cone conformation of the new bridged calix[6]arenes has been established by a full set of 1D/2D 1H and 13C NMR techniques. These compounds are substantially more rigid than calix[6]arene analogues with an A,D‐p‐xylylene bridge, and the resulting cavities are better defined. Molecular mechanics optimization of triply bridged calix[6]arenes 2b and 2c resulted in structures fully consistent with the NMR spectra. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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