Comparative Study of the Phospha‐ and Arsa‐Wittig Reaction Using 1H, 75As and 17O NMR Spectroscopy

Abstract The existence of oxaarsetanes during an arsa‐Wittig reaction has been proved by 1H and 17O NMR spectroscopy. 75As NMR spectra were obtained from the corresponding arsonium salts and arsane oxides. The dynamic 1H NMR spectra of phospha‐ and arsaylides were compared. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)