Homogeneous Catalytic Olefin Epoxidation with Molybdenum Complexes

N-heterocyclic carbene complexes of Group 6 metals

“…Although many NHCs with different backbones and topologies have been reported [48,49], the NHC ligand motifs of Group 6 complexes are restricted to the most commonly used NHC with imidazole core, and a few M a n u s c r i p t Some of the η 5 -Cp Mo(II)-NHC complexes and some Mo(VI), W(VI) and Cr-NHC were found in recent reviews in the catalytic olefin epoxidation with η 5 -Cp Mo complexes [50,51], transition metal NHC complexes in high oxidation states [52] and metal catalyzed olefin oligomerization and polymerization [53,54]. However, there has been no dedicated and comprehensive review in Group 6 metal NHC complexes.…”

Catalytic epoxidation using dioxidomolybdenum(VI) complexes with tridentate aminoalcohol phenol ligands

“…Complexes containing a cis-[MoO2] 2+ moiety play crucial roles in catalytic oxidation reactions such as alkene epoxidation [1] and oxotransfer reactions [2,3]. Molybdenumcatalysed epoxidation reactions are of interest for the production of both bulk and fine chemicals [1,4,5].…”

“…Complexes containing a cis-[MoO2] 2+ moiety play crucial roles in catalytic oxidation reactions such as alkene epoxidation [1] and oxotransfer reactions [2,3]. Molybdenumcatalysed epoxidation reactions are of interest for the production of both bulk and fine chemicals [1,4,5]. In a number of studies, dioxidomolybdenum(VI) complexes with chelating phenolate ligands have been used as catalysts for catalytic oxidation reactions such as oxidative bromination, oxotransfer form DMSO to PPh3 and alkene epoxidation [6].…”

“…In ligand H3L 3 , the uncoordinated alcoholic hydroxyl group is in close vicinity to the molybdenum centre and may form a hydrogen bond with incoming oxidants like tert-butyl hydroperoxide (tBuOOH) or hydrogen peroxide (H2O2) in the first step of the catalytic epoxidation reaction. The ligand H2L 1 was previously used for the preparation of the bis(μ-alkoxido)diiron(III) complexes [Fe(X1)L 1 ]2 (X1 = acac -, Cl -) [16] and the monomeric oxidotungsten(VI) complexes [WO(X2)(L 1 )] (X2 = ethylene glycolate, X = Cl -) [17]. The magnetic properties of these iron complexes and the ring-opening metathesis polymerization activities of the tungsten complexes were studied.…”

Synthesis of olefins via a Wittig reaction mediated by triphenylarsine

“…Of the de novo olefin synthetic methods, 1–2 the Wittig reaction is the most common variant employed. First discovered in 1953, 3–4 it remains among the most common C-C bond forming reactions performed in medicinal chemistry and total synthesis.…”