Oxidation Of Alcohols In Water Research Articles

Pd(II)-biquinoline catalyzed aerobic oxidation of alcohols in water

Abstract An aqueous palladium catalyst that is stabilized by a water-soluble biquinoline-based ligand was employed for the aerobic oxidation of secondary and primary alcohols. Secondary alcohols afforded the corresponding ketones in high yield with selectivities greater than 90%. Aliphatic primary alcohols were fully oxidized to carboxylic acid products under the same reaction conditions, with various amounts of ester byproduct. Benzyl alcohol can be converted to a mixture of benzaldehyde and benzoic acid, where the relative amounts are dependent on the reaction conditions, while substituted benzylic alcohols gave primarily benzaldehyde derivatives. In contrast to related systems, the catalyst used in this study is tolerant of additional coordinating groups on the benzyl alcohol substrate. In all examples of alcohol oxidation, water is used as the only reaction solvent and air is used as the oxidant, thus these conversions could serve as environmentally benign “green” alternatives to traditional oxidation methods.

Catalytic Oxidation of Alcohols in Water under Atmospheric Oxygen by Use of an Amphiphilic Resin‐Dispersion of a Nanopalladium Catalyst.

Catalytic Oxidation of Alcohols in Water under Atmospheric Oxygen by Use of an Amphiphilic Resin‐Dispersion of a Nanopalladium Catalyst.

A Water-Soluble and “Self-Assembled” Polyoxometalate as a Recyclable Catalyst for Oxidation of Alcohols in Water with Hydrogen Peroxide

We have demonstrated that a simply prepared water-soluble polyoxometalate, Na12[WZnZn2(H2O)2(ZnW9O34)2], synthesized from readily available zinc and tungsten salts in the presence of nitric acid, is an effective catalyst for selective alcohol oxidation with hydrogen peroxide in biphasic (water-alcohol) reaction media. Experiments have shown that the "self-assembled" catalyst in its mother liquor was as active as the isolated catalyst. The aqueous catalyst solution is easily separated from the water-insoluble products and can be recycled without loss in activity or selectivity.

Catalytic oxidation of alcohols in water under atmospheric oxygen by use of an amphiphilic resin-dispersion of a nanopalladium catalyst.

A step closer to the ideal oxidation of alcohols: Catalytic oxidation of alcohols in water under atmospheric oxygen was achieved by use of an amphiphilic resin-dispersion of a nanopalladium catalyst (see scheme). This system combines high catalytic activity owing to the large surface area of the nanoparticles and water-based reactivity provided by the amphiphilicity of the polystyrene—poly(ethylene glycol) matrix.

Catalytic Oxidation of Alcohols in Water under Atmospheric Oxygen by Use of an Amphiphilic Resin‐Dispersion of a Nanopalladium Catalyst

Catalytic Oxidation of Alcohols in Water under Atmospheric Oxygen by Use of an Amphiphilic Resin‐Dispersion of a Nanopalladium Catalyst

Facile and Clean Oxidation of Alcohols in Water Using Hypervalent Iodine(III) Reagents.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Catalytic Conversions in Water. Part 21: Mechanistic Investigations on the Palladium-Catalysed Aerobic Oxidation of Alcohols in Water†

Water-soluble complexes of palladium(II) with phenanthroline-derivatives are stable, recyclable catalysts for the selective aerobic oxidation of a wide range of alcohols to aldehydes, ketones, and carboxylic acids in a biphasic liquid-liquid system. The active catalyst is a dihydroxy-bridged palladium dimer. Kinetics of the reaction, ligand and anion effects are discussed.

Facile and Clean Oxidation of Alcohols in Water Using Hypervalent Iodine(III) Reagents

The facile and efficient oxidation of various alcohols such as benzylic alcohols, primary alcohols, secondary alcohols, and diols in water using the hypervalent iodine(III) reagent, iodosobenzene (PhI=O), with KBr is described. Electrospray ionization (ESI) mass spectrometric studies on the behavior of PhI=O-KBr in aqueous solution suggested that these reactions are induced by the formation of highly reactive iodine species [PhI(Br)nO –]. Further development to recyclable polymer-supported iodine(III) reagent extends the utility of this reaction to afford an environmentally benign method.

Facile and Clean Oxidation of Alcohols in Water Using Hypervalent Iodine(III) Reagents

Eine umweltschonende Oxidation von Alkoholen in Wasser mit Iodosobenzol (PhI=O) oder polymergebundenem (Diacetoxyiodo)benzol (PSDIB) wurde in Gegenwart von KBr erreicht (siehe Schema). Auf diese Art kann eine Vielzahl an reaktionsträgen und/oder schlecht löslichen hypervalenten Iodreagentien in Wasser unter neutralen Bedingungen katalytisch aktiviert werden.

Facile and Clean Oxidation of Alcohols in Water Using Hypervalent Iodine(III) Reagents This research was supported in part by a Grant-in-Aid for Scientific Research (B) (No. 10470469) from the Ministry of Education, Science, Sports, and Culture, Japan and a Grant-in-Aid for Encouragement of Young Scientists (No. 11771382) from the Japan Society for the Promotion of Science.

Facile and Clean Oxidation of Alcohols in Water Using Hypervalent Iodine(III) Reagents This research was supported in part by a Grant-in-Aid for Scientific Research (B) (No. 10470469) from the Ministry of Education, Science, Sports, and Culture, Japan and a Grant-in-Aid for Encouragement of Young Scientists (No. 11771382) from the Japan Society for the Promotion of Science.

Green, catalytic oxidation of alcohols in water

Alcohol oxidations are typically performed with stoichiometric reagents that generate heavy-metal waste and are usually run in chlorinated solvents. A water-soluble palladium(II) bathophenanthroline complex is a stable recyclable catalyst for the selective aerobic oxidation of a wide range of alcohols to aldehydes, ketones, and carboxylic acids in a biphasic water-alcohol system. The use of water as a solvent and air as the oxidant makes the reaction interesting from both an economic and environmental point of view.