Vanadium catalyzed oxidation with hydrogen peroxide

Abstract

a b s t r a c tVanadium peroxides are known as very effective oxidants of different organic and inorganic substrates. In this short account reactivity, structural and mechanistic studies concerning the behaviour of peroxovanadates toward a number of different substrates are collected. Homogeneous and two-phase systems are presented, in addition, interesting synthetic results obtained with the use of ionic liquids as reaction media are also presented.

Mechanistic aspects of vanadium catalysed oxidations with peroxides

“…A collection of the original papers is found in diverse chapters and reviews [8,19,21,22,[24][25][26]35]. Here we would like to point out that Path A mechanism of Scheme 5 is in agreement with the kinetic and spectroscopic data collected from several research groups.…”

“…Recent book chapters [9,[19][20][21] and reviews [8,22,23] have been dedicated to this topic. Furthermore, this general behaviour applies also to vanadium catalysis [21,24]…”

“…The most active d 0 metal peroxo complexes toward nucleophilic substrates, like amines, phosphines, thioethers, double bonds, etc., are molybdenum, tungsten and rhenium derivatives [19,21,25,26]; vanadium [23,24,75] and titanium [33,34] catalysis is also important in particular for enantioselective processes. Numerous studies have been carried out in the last decades, with all the d 0 metals involved in this type of catalysis, to clarify the mechanism of the oxygen transfer step and also to understand the transfer of chirality in enantioselective processes.…”

Zeolite-Y encapsulated VO[2-(2′-hydroxyphenyl)benzimidazole] complex: investigation of its catalytic activity towards oxidation of organic substrates

“…3a). The g k was found to be 1.917, while g \ was 1.970 corresponding to the presence of VO(H 2 O) 5 2? [27].…”

“…unit (vanadyl ion) and have square pyramidal or trigonal bipyramidal geometries with an axial oxo ligand. Oxovanadium center can act as Lewis acid towards electron rich species such as peroxides [H 2 O 2 or t-butyl hydroperoxide (TBHP)] to form metalloperoxo species, which are proficient in transferring an oxygen atom to a wide range of organic and inorganic substrates [5,6]. Furthermore, the use of environmentally friendly oxidants like hydrogen peroxide upsurges significantly their potential applications.…”