Ruthenium catalyzed selective oxidation of aryl thiophenes using hydrogen peroxide

Oxidation of Thiophene Derivatives with H2O2 in Acetonitrile Catalyzed by [Cp*2M2O5] (M = Mo, W): A Kinetic Study

“…According to the DFT calculations, the Hückel-type bonding orbitals shown in Figure 2 for BT (no. [32][33][34][35] and for DBT (no. [44][45][46][47][48] are slightly modified in energy and shape, because of the removal of the sulfur contribution (see details in the Supporting Information).…”

“…Studies of this type require a solvent that is capable of dissolving simultaneously the highly hydrophobic substrates and the oxidant. This has been accomplished with MeCN−H 2 O and t BuOH−H 2 O mixtures , or with neat MeCN, when performing oxidations with aqueous H 2 O 2 , or with CHCl 3 , CH 2 Cl 2 , or toluene, when using TBHP . The investigated homogeneous catalysts include methyltrioxorhenium (MTO), a variety of oxorhenium(V) derivatives, an iron system with a tetraamidomacrocyclic ligand, and a few Ru(II) bis(phenanthroline) type complexes …”

“…35 The investigated homogeneous catalysts include methyltrioxorhenium (MTO), 33 a variety of oxorhenium(V) derivatives, 35 an iron system with a tetraamidomacrocyclic ligand, 29 and a few Ru(II) bis(phenanthroline) type complexes. 34 Some of us have recently carried out extensive studies on the aqueous chemistry of the compounds [Cp* 2 M 2 O 5 ] (M ) Mo (1), W (2)), 36,37 which include an improved and simplified synthetic procedure, 38 a detailed speciation study for the Mo system, 39,40 and the application of 1 to the catalytic cyclooctene epoxidation in CHCl 3 and water. 41 We have now extended our catalytic investigations to the oxidation of the thiophene derivatives BT, DBT, and DMDBT with H 2 O 2 in MeCN and report here the results of these studies.…”

Spctrophotometric Determination of Trace Ruthenium by its Catalytic Effect on Oxidation of 3,5-DiBr-PADAP with KIO₄

“…Above all, ruthenium and its complexes have long been recognized as an efficient catalyst for large number of reactions of commercial and environmental importance [12][13][14] and exhibit classical catalyst characteristics in acidic as well as in alkaline media [15]. Highly selective ruthenium catalyzed oxidations of organic compounds have been carried out using suitable oxidants [16,17]. Thus, the versatile use of ruthenium in different fields justifies special attention to develop low cost, selective, sensitive and precise methods for its determination at trace levels.…”