An approach to calix[6]cryptands with bridgehead carbon atom: Stabilized in- and out- stereoisomers

Article abstract of DOI:10.1016/S0040-4020(98)00963-6

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