Li-Hong Huang

Manganese Dioxide Supported on Aluminum Silicate: A New Reagent for Oxidation of Alcohols Under Heterogeneous Conditions

Abstract Manganese dioxide supported on aluminum silicate, under heterogeneous conditions at reflux, selectively oxidized aromatic primary and secondary alcohols into the corresponding aldehydes and ketones, respectively, in yields of 87–96%. The present method failed to oxidize aliphatic alcohols. GRAPHICAL ABSTRACT

New Reagent, Manganese Dioxide Supported on Kieselguhr, for Effective Oxidation of Benzoins

Abstract A new reagent, manganese dioxide supported on kieselguhr, for effective oxidation of benzoins into corresponding benzils under heterogeneous and reflux conditions is described. The present oxidations are completed within 10 h with yields of 86–95%. The main advantages of the present procedure are that the preparation of supported reagent is more convenient and the reaction times are relatively short.

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.

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%.

Selective Oxidation of Alcohols with a New Reagent: Iron(III) Nitrate Supported on Aluminum Silicate

Abstract A selective and effective oxidation of alcohols, except aliphatic alcohols, such as 1‐hexanol or 1‐octyl alcohol, to the corresponding aldehydes and ketones using a new reagent, iron(III) nitrate supported on aluminum silicate, under heterogeneous conditions with reflux with 85–98% yield is described.

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 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.

Synthesis, Characterization, and Structure of a Silver(I) Compound With Thymine

The interaction of [Ag(PPh3)2(CH3COO)] (1) with thymine led to the displacement of the acetate ligand forming the mononuclear compound [Ag(PPh3)2(C5H5N2O2)] (2). This compound has been characterized by IR, NMR, element analysis, and X-ray crystallographic analysis. Crystal structure of 2 shows each Ag ion is three-coordinated by two P atoms of the triphenylphosphino ligands and one N atoms of the thymine, which is stabilized by two intermolecular N-H…O and O-H…O hydrogen bonding interactions.