The oxidizing ability of peroxodisulfate upon complexation inside the Bambusuril macrocycle cavity is inhibited. This dianionic agent can be released on demand from its stable 1:1 complex in water (log Ka =6.9 m-1 ) by addition of a more strongly bound anion, such as iodide (log Ka =7.1 m-1 ), which can also be delivered in situ upon irradiation from a 4-hydroxyphenacyl iodide derivative with spatial and temporal precision. The oxidizing properties of peroxodisulfate ions liberated from the complex recover and can take part in subsequent chemical transformations.

CEITEC Central European Institute of Technology and National Centre for Biomolecular Research Masaryk University Kamenice 5 625 00 Brno Czech Republic

Department of Chemistry and RECETOX Faculty of Science Masaryk University Kamenice 5 625 00 Brno Czech Republic

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Unsubstituted Bambusurils: Post-Macrocyclization Modification of Versatile Intermediates