Remarkable Effect of Bimetallic Nanocluster Catalysts for Aerobic Oxidation of Alcohols: Combining Metals Changes the Activities and the Reaction Pathways to Aldehydes/Carboxylic Acids or Esters

Abstract

Selective oxidation of alcohols catalyzed by novel carbon-stabilized polymer-incarcerated bimetallic nanocluster catalysts using molecular oxygen has been developed. The reactivity and the selectivity were strongly dependent on the combination of metals and solvent systems; aldehydes and ketones were obtained by the gold/platinum catalyst in benzotrifluoride, and esters were formed by the gold/palladium catalyst in methanol. To the best of our knowledge, this is the first example that the reaction pathway has been changed dramatically in gold catalysis by combining with a second metal. The differences in the activity and the selectivity are considered to be derived from the difference in the structure of the bimetallic clusters.

A facile and efficient synthesis of polystyrene/gold–platinum composite particles and their application for aerobic oxidation of alcohols in water

“…[5][6][7][8] In order to overcome this shortcoming, a lot of developments have been made towards the design and preparation of new catalysts in the past few decades. 1-4 Traditionally, the alcohol oxidation is performed by using stoichiometric amounts of expensive and toxic inorganic oxidants, such as chromate or permanganate, which usually cause environmental problems due to the large amounts of by-products.…”

An Efficient Partial Reduction of α,β‐Unsaturated Esters Using DIBAL‐H in Flow

“…1 (E)-Cinnamaldehyde (1d): [25] (E)-3-(4-Bromophenyl)-2-propenal (1e): [26] (E)-3-(4-Methoxyphenyl)-2-propenal (1f): [27] (E)-2,4-Dinitrophenylhydrazone of Benzaldehyde (1g): [28] Collection time for the aldehyde: 1 min; yellow solid (208.0 mg, 81 %, as a hydrazone), m.p. 1 [30] Synthesis of (E)-5-(Triphenylmethylthio)-2-pentenal (8) [12] Method 1: One-step flow method (Table 3, Method 2: One-step batch method (Table 3, entry 2). 1 [30] Synthesis of (E)-5-(Triphenylmethylthio)-2-pentenal (8) [12] Method 1: One-step flow method (Table 3, Method 2: One-step batch method (Table 3, entry 2).…”

Title Pages

“…alcohols with ammonia affords the corresponding prim. amines 30 , and application of bimetal nanoclusters allows selective aerobic oxidation of alcohols to aldehydes/ carboxylic acids or esters 31 .…”