Oxo(corrolato)vanadium(iv) catalyzed epoxidation: oxo(peroxo)(corrolato)vanadium(v) is the true catalytic species

Abstract

de Visser et al. have demonstrated theoretically that although vanadium(IV)-oxo complexes are slow oxidants, however in the presence of H2O2, it has generated a side-on vanadium-peroxo complex, which is...

Oxido-Molybdenum(V) Corroles as Robust Catalysts for Oxidative Bromination and Selective Epoxidation Reactions in Aqueous Media under Mild Conditions

“…1 exhibited comparatively better TOF values than those reported in the literature, and 2 was found to be substantially more efficient and thus a very strong catalyst for the selective epoxidation of olefins under ambient reaction conditions. Some recent vanadium corroles in the literature have shown better TOF values than catalyst 1 or 2 , but in some cases, TOF values are very low as 400 h –1 with some olefins for these vanadium corroles . Also, these molybdenum corrole catalysts employed in the current study are still better as they complete the reaction in 2 h with good TOFs using the green methodology than previously reported molybdenum corrole catalysts .…”

“…Some recent vanadium corroles in the literature have shown better TOF values than catalyst 1 or 2, but in some cases, TOF values are very low as 400 h −1 with some olefins for these vanadium corroles. 31 Also, these molybdenum corrole catalysts employed in the current study are still better as they complete the reaction in 2 h with good TOFs using the green methodology than previously reported molybdenum corrole catalysts. 28 Earlier, it has been reported that other metallocorroles are good catalysts, but the TOF values are very low.…”

“…28−30 Very recently, Kar and coworkers have employed oxido-vanadium(IV) corroles as a catalyst for epoxidations of olefins in the presence of H 2 O 2 as an oxidant and KHCO 3 as a promoter. 31 Furthermore, manganese corrole complexes were a very efficient catalyst in the copolymerization of epoxides 32 and CO 2 fixation with epoxides. 33 Bromination has traditionally been done with liquid bromine, NBS, hypobromites, phosphorus tribromide, bromine chloride, aluminum tribromide, and others.…”

“…Epoxides are excellent synthons in organic synthesis and are useful as a fumigant to antifreeze compounds like ethylene glycol, assembling polymers (epoxies), adhesives in surface coatings, surfactants, detergents, structural materials, and stabilizers in PVC. − Various metallocorroles including Fe IV , Mn III , Co III , and Mo V were found to be very useful catalysts for olefin epoxidation reactions. − Very recently, Kar and coworkers have employed oxido-vanadium(IV) corroles as a catalyst for epoxidations of olefins in the presence of H 2 O 2 as an oxidant and KHCO 3 as a promoter . Furthermore, manganese corrole complexes were a very efficient catalyst in the copolymerization of epoxides and CO 2 fixation with epoxides …”

Synthesis and Characterization of New Lutidinium Ionic Liquid‐Supported Vanadylsalicylaldoxime Complex for Catalytic Application in Epoxidation Reaction

“…[38] To this end, a wide variety of vanadium complexes with distinct ligands (starting from [VO-(acac) 2 ] and extended to involve the complexes of various Schiff base or salen kinds of ligands) have been widely used effectively in epoxidation reactions. [38] In addition, a few oxime-based vanadium(IV) complexes are also successfully employed as catalysts for olefin epoxidation. [39,40] Nevertheless, these vanadium(IV)-oxime complexes exhibit limited catalytic activity, and their preparation routes are sophisticated and expensive.…”