Formation of S‐Shaped Disilicoicosatungstate and Efficient Baeyer–Villiger Oxidation with Hydrogen Peroxide

Partial protonation of a divacant lacunary Keggin-type silicodecatungstate in an anhydrous organic solvent led to dehydrative condensation and formation of a novel S-shaped disilicoicosatungstate (see picture). The S-shaped cluster efficiently promotes Baeyer–Villiger oxidation of cycloalkanones with high turnover numbers (TONs, ≥1900) and high selectivities (≥90 %) for the corresponding lactones. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2006/z502543_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.