Recent advances in oxidative catalytic applications of polyoxovanadate-based inorganic–organic hybrids

Abstract

Polyoxovanadates (POVs) have received widespread attention in catalytic application due to their various structures and remarkable redox properties. By introducing second transition metal, POVs-based inorganic-organic hybrids (POVH) catalysts show increasing...

An iron-containing POM-based hybrid compound as a heterogeneous catalyst for one-step hydroxylation of benzene to phenol

“…Polyoxometalates (POMs), as a class of inorganic metal oxide clusters with a rich structure and excellent redox properties, have attracted broad attention in the fields of catalysis, optics, magnetism, etc . 20–32 Among numerous POM-based materials, molybdovanadophosphoric acid (PMoV) with the Keggin structure has attracted the attention of a wide range of researchers. Since this form of polyacid has abundant and variable metal valence states, it can activate molecular oxidation to obtain reactive oxygen species and easily selectively oxidize reactive organic substrates without the addition of reducing agents.…”

Polyoxometalate-based ionic liquids: efficient reversible phase transformation-type catalysts for thiolation of alcohols to construct C–S bonds

“…Based on the above discussion, we assume that acidic POM-ILs may be a suitable type of catalyst for the preparation of thioethers by the thiolation of alcohols. In continuation of our investigation in the catalytic field of POMs, 43,44 herein, we synthesized a series of POM-based ILs derived from N -alkyl imidazole (POM-ILs-SO 3 H) (Scheme 1), and they were used as catalysts in the thiolation reaction of benzyl alcohols for the first time. To our delight, thanks to its excellent solubility in acetonitrile at an optimized temperature (70 °C), as a reversible phase transformation-type catalyst, [PIMPS] 3 PW 12 O 40 exhibited more efficiency than [MIMPS] 3 PW 12 O 40 and [EIMPS] 3 PW 12 O 40 (MIM = 1-methylimidazole, EIM = 1-ethylimidazole, PIM = 1-propylimidazole, PS = propane sulfonate), providing up to 98% isolated yield for the thiolation of alcohols (Scheme 2).…”