Ji-Dong Lou

Effective Oxidation of Alcohols under Heterogeneous Conditions with a New Reagent: Manganese Dioxide Supported on Graphite

A new reagent, manganese dioxide supported on graphite, under heterogeneous conditions at reflux is described for the oxidation of benzylic and allylic alcohols into the corresponding aldehydes and ketones, respectively. The main advantage of the present oxidation is that the insoluble solid support, graphite, provides a particular reaction environment capable of enhancing the reaction selectivity and reactivity. Moreover, it turns out to be very profitable in the workup, which becomes reduced to a mere filtration. The mechanism for this oxidation is also discussed.

Efficient Oxidative Cleavage of Oximes to Their Corresponding Carbonyl Compounds with Chromic Acid Supported on Kieselguhr Under Heterogeneous Conditions

An efficient oxidative cleavage of oximes to their corresponding carbonyl compounds with chromic acid supported on kieselguhr reagent under heterogeneous conditions at reflux with a yield between 86 and 96% is described. In these reaction conditions, deoximation of aldoximes required a longer reaction time than that of ketoximes, and the conditions are not suitable for deoximation of aliphatic aldoximes.

A simple, rapid, and efficient oxidation of oximes to ketones and aldehydes with manganese dioxide catalyzed by kieselguhr under solvent-free conditions

A simple, rapid, and efficient oxidation of oximes to the corresponding ketones and aldehydes with manganese dioxide catalyzed by kieselguhr under solvent-free conditions at room temperature in the yields between 82 and 98 is described. It seems that kieselguhr in the present procedure can highly expedite the reaction rate. By comparing to other methods described previously, the main advantages of this oxidation are that the oxidations are more efficient, the reaction conditions are milder, the reaction times are shorter, and the work-up is easier. Furthermore, the amount of manganese dioxide used in this oxidation is largely decreased.

A Facile Procedure for the Conversion of Oximes to Ketones and Aldehydes by the Use of Jones Reagent Adsorbed on Kieselguhr Reagent

An efficient oxidation of oximes to their corresponding ketones and aldehydes with Jones reagent supported on kieselguhr under heterogeneous conditions at room temperature in the yield between 84 and 93% is described. The present procedure is an extension of application of Jones reagent supported on kieselguhr.

An Efficient Oxidation of Benzoins with the Jones Reagent Supported on Kieselguhr

The heterogeneous room-temperature oxidation of benzoins with the Jones reagent supported on kieselguhr provides an efficient method for the preparation of the corresponding benzyls. The oxidations described in the present study were complete within 30 min with yields of between 82–93%.

A Mild and Environmentally Benign Procedure for the Oxidative Cleavage of Oximes with Potassium Permanganate Supported on Kieselguhr

A facile, mild, and relative environmentally friendly procedure for the regeneration of aldehydes and ketones from their oximes with potassium permanganate supported on kieselguhr reagent at room temperature under heterogeneous conditions in the yield between 82–96% is described.

Syntheses, Characterization, and Structures of Two (Arene)Ru(II) Complexes Containing Amino Acids

Two new complexes, [(p-cymene)RuCl(CH2OHCHNH2 (COO))] (1) and [(p-cymene)RuCl(CH3CH(OH)CHNH2(COO))] (2), respectively, have been synthesized and characterized with IR, NMR, ESI-MS, elemental analysis, and X-ray crystallographic analysis. Their crystal structures show that these new half-sandwich ruthenium (II) complexes have three-legged “piano-stool” geometry, and intermolecular hydrogen bonds were observed.

Selective Oxidation of Benzoins with Potassium Dichromate Under Viscous Conditions

An efficient procedure for oxidation of benzoins to corresponding benzils using potassium dichromate under viscous conditions at room temperature is described. The procedure can overcome the problems existed in the common solvent-free reactions of the difficulty for the solid molecular collision to react. The present oxidations are completed within 3 hours with the yield between 86–97%.

Syntheses, characterization, and structures of three ruthenium complexes containing two monodentate dppm ligands

Three cis-Ru(dppm)2XY complexes (XY = C2O4, 1; X = Cl, Y = N3, 2; X = Y = N3, 3) were prepared by reactions of cis-Ru(dppm)2Cl2 with (NH4)2C2O4, a mixture of NaN3 and NaPF6, and only NaN3, respectively, while 3 could also be obtained from further reaction of 2 with NaN3 undergoing a facile chloride abstraction. All complexes have been characterized by IR, NMR, UV–vis, and luminescence spectroscopic analyses as well as X-ray diffraction studies. Of these structures, 1 shows oxalate coordinates to Ru as a chelating ligand, while 2 displays Ru and azide linear, and 3 gives two azide groups cis to each other, which are different from two substituting ligands commonly lying in trans positions in Ru(P–P)2 complexes by using cis-Ru(dppm)2Cl2 as a precursor. Graphical Abstract

Synthesis, Characterization, and Structure of Ruthenium Complex Ru(dppe)2C2O4 (dppe = Ph2P(CH2)2PPh2)

The title complex Ru(dppe)2C2O4 (dppe = Ph2P(CH2)2PPh2) was synthesized and determined by IR, NMR, elemental analysis, and X-ray crystallographic analysis. The structure shows Ru atom was coordinated with four phosphorus atoms of two dppe ligands and two oxygen atoms of oxalate ligand in a distorted octahedral geometry.