Dynamic interconversion between large covalent org. cages was achieved simply by heating or acid/base treatment. A mixt. of the boroxine cages 12-mer and 15-mer was cleanly converted into a pyridine adduct of the 9-mer boroxine cage upon treatment with pyridine, and the geometry of N-coordinated boron atoms changed from trigonal to tetrahedral. The reverse reaction was achieved by heating or acid treatment. In this process, the larger boroxine cages 12-mer and 15-mer were entropically favored owing to the release of free pyridine mols. from 9-merﾂｷ6Py. [on SciFinder(R)]
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