Sn(iv) phosphonates as catalysts in solvent-free Baeyer-Villiger oxidations using H(2)O(2).

We have designed a new family of layered Sn(iv)phosphonate (SnPP) materials which are very efficient catalysts in the BV oxidation of aromatic aldehydes without any solvent and using aqueous H(2)O(2) (30%) as the oxidant.