Synthesis, structural characterization and catalytic properties of a novel monomeric rhenium(V)methyl(oxo)bis(η2-picolinato) complex: [CH3Re(O)(pic)2] †

Abstract

A methyl mono-oxo rhenium(V) complex with two picolinato chelating ligands has been synthesized and structurally characterized. When reacted with excess 10 or 30% H 2 O 2 it forms peroxo species responsible for the catalytic activity of a highly selective two-phase medium.

Oxidorhenium(V) Complexes with Tridentate and Tetradentate Phenol‐Based Ligands

“…[16,17,19,41,45] Recently, we investigated complexes of the type [ReOCl 2 (L)(PPh 3 )] and [ReOCl(L) 2 ] (L = oxo iminato ligands) in the reaction of cyclooctene with TBHP in which a conversion to the epoxide of 55 % was observed. [18,20] To explore the influence of additional donors in the catalyst on the catalytic activity, we tested rhenium complexes 1 to 14 in the model reaction shown in Scheme 4.…”

“…For this reason, more stable oxidorhenium(V) complexes were also investigated as catalysts in epoxidations albeit as yet with limited success. [16][17][18][19][20] The rhenium(V) systems investigated so far show significantly lower activity or productivity than rhenium(VII) systems. In contrast to applications in oxidation reactions, oxidorhenium(V) compounds were recently found to be catalysts in several other reactions.…”

Nucleophilic addition of water to 1-isoquinolinyl phenyl ketone. The synthesis, spectroscopic investigation, crystal and molecular structure and DFT calculations of [ReOBr2(iquinpk-OH)(PPh3)]

“…The attention of scientists concentrates on synthetic aspects, structural, physicochemical properties and reactivity, as well as on topics with an applied character such as the development of radiotherapeutic cancer agents, nitrogen fixation and catalysis [1][2][3][4][5][6][7][8][9][10].…”

Another Example of the Instability of a Keggin‐Type Heteropolyanion in the Presence of Aqueous Hydrogen Peroxide: From [AsW12O40]3– to Low‐Nuclearity Oxoperoxotungstates – Crystal Structure of [(nHex)4N]3[AsO4{W2O2(μ‐O2)2(O2)2}2]

“…They transfer active oxygen to (R)-(+)-limonene to mostly give the monoepoxides, which are known to be acid-sensitive. [55][56][57] Complete optimisation must consider the effects of the organic solvent, the nature of Q + , the assembling ligand X and the anionic species (Cl -, Br -, HSO 4 -, etc. ), the pH of the aqueous phase, the presence of Na + Cl -and the W/X/Q + ratios, and these factors have been analysed in detail by several groups.…”