Abstract
An improved method for palladium(II)-catalyzed Wacker oxidation of cyclic and internal olefins is described. Addition of perchloric, sulfuric, nitric, or tetrafluoroboric acid to a chloride free solution of the Pd(II) catalyst gives rate enhancements of up to a factor of 50. The oxidation of cyclohexene to cyclohexanone, which was previously reported to give a 97% yield after 5 h, is now accomplished in 1 h quantitatively, with only one-third of the amount of Pd(II) used. Limitations of the method are also discussed
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