Aerobic oxidation of pinacol by vanadium(V) dipicolinate complexes: evidence for reduction to vanadium(III)

J Am Chem Soc. 2009 Jan 21;131(2):428-9. doi: 10.1021/ja807522n.

Abstract

The reactivity of vanadium complexes bearing the ligand dipicolinic acid (H(2)dipic) with alcohols has been explored. Dipic vanadium complexes are able to catalyze the aerobic oxidative C-C bond cleavage of pinacol. Reaction under anaerobic conditions allowed for isolation of a V(III) mu-oxo dimer, supporting the involvement of V(III) in aerobic oxidation reactions. Stoichiometric oxidation of unactivated aliphatic alcohols has also been observed, with oxidation of cyclobutanol producing cyclobutanone in 93% yield. The absence of ring-opening products in this reaction provides further support for the involvement of V(III) intermediates.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Aerobiosis
  • Butylene Glycols / chemistry*
  • Crystallography, X-Ray
  • Ligands
  • Magnetic Resonance Spectroscopy
  • Oxidation-Reduction
  • Picolinic Acids / chemistry*
  • Spectrophotometry, Infrared
  • Spectrophotometry, Ultraviolet
  • Vanadium Compounds / chemical synthesis
  • Vanadium Compounds / chemistry*

Substances

  • Butylene Glycols
  • Ligands
  • Picolinic Acids
  • Vanadium Compounds
  • dipicolinic acid