IBX Oxidation of Benzenedimethanols in the Presence of Cucurbit[8]uril

The cucurbit8]uril (Q8]) mediated oxidation of benzenedimethanols with o‐iodoxybenzoic acid (IBX) in aqueous solution has been investigated, and the results reveal the supramolecular catalysis depends on the electronic and geometric structure of substrate. In the cases of o‐benzenedimethanol ( 1a ) and m‐benzenedimethanol ( 1b ), the IBX oxidation could be obviously enhanced by the addition of Q8] at different extent. There is no observation of the catalytic activity of Q8] when p‐benzenedimethanol ( 1c ) is subjected to the IBX oxidation. The addition amount of Q8] is discussed herein, and the addition of more than 10% mol catalyst cannot improve the oxidation much more. The investigation of host‐guest interactions by isothermal titration calorimetry implies the supramolecular catalysis is related to the formation of complexes between benzenedimethanols and cucurbit8]uril.