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A new approach to cap 1,3,5-trimethyloxy-p-tert-butyl calix[6]arene with 1,1,1-tri(tosyloxyethoxyethoxymethyl)propane to form a pair of separable stabilized in- and out- calix[6]cryptands was reported. After heating 5a or 5b at 280°C, the interconversion between them was not detected by TLC, which provides a direct and non-spectral methodology to obtain unambiguous evidence for the ring immobilization...
The synthesis and complexation properties of a novel type of double-calixcrown in which two cone-conformational calix[4]crown subunits were linked via a spiro C-atom incorporated into poly(oxyethylene) chains were described.
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