3 years ago

Dynamic Interconversion among Boroxine Cages Based on Pyridine Ligation

Nobuharu Iwasawa, Nobuhiro Yasuda, Shunsuke Shimo, Hidehiro Uekusa, Kosuke Ono, Kohei Takahashi
Dynamic interconversion between large covalent organic cages was achieved simply by heating or acid/base treatment. A mixture of boroxine cages 12-mer and 15-mer was cleanly converted to a pyridine adduct of boroxine cage 9-mer on treatment with pyridine, where the geometry of N-coordinated borons changed from trigonal to tetrahedral. The reverse reaction was achieved by heating or acid treatment, where the larger boroxine cages 12-mer and 15-mer were found to be entropically favorable due to the release of free pyridine molecules from 9-mer*6Py.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201713221

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