Catalytic properties of several palladium complexes covalently anchored onto silica for the aerobic oxidation of alcohols

Abstract

A series of novel silica-supported palladium catalysts bearing N-N, N-S and N-O chelating ligands have been prepared and tested for the aerobic oxidation of alcohols to carbonyl compounds. The most active catalyst, 1, was used for the oxidation of a series of primary and secondary alcohols to carbonyl compounds. The catalyst is highly selective and no over-oxidation products were detected. The catalyst 1 can also be used for the oxidation of primary benzyl alcohols to carbonyl compounds with comparable yields in the presence of atmospheric air.

Silica-Bonded N-Propyl Sulfamic Acid Catalyzed One-Pot Synthesis of Aryl-14-H-dibenzo[a,i]xanthenes

“…In recent years, the search for environmentally benign chemical processes or methodologies has received much attention 8 . Heterogenization of homogeneous catalysts has been an interesting area of research from an industrial point of view; this combines the advantages of homogeneous catalysts (high activity, selectivity, etc.)…”

Three-component carbon-carbon bond-forming reactions for the synthesis of β-amino carbonyl compounds using maleic acid-catalyzed one-pot mannich-type reaction in ethanol

“…The development of catalyst for synthetic methods has become an important research area, aiming to make the syntheses simpler, to save energy and to prevent toxicity in chemical processes. In recent years, the search for environmentally benign chemical processes or methodologies has received much attention (CHOUDHARY et al, 2006;KURESHY et al, 2010;. Therefore, in chemistry "ideal synthesis" has been defined as one in which the target compound is generated in one step, in efficiency yield, from readily available and inexpensive starting materials in a resource-effective and environmentally acceptable process (SANDAROOS and DAMAVANDI, 2013).…”

Selective oxidation of rhodinol to citral using H2O2-platinum black system under microwave irradiation

“…The oxidation of allylic alcohol to aldehyde is highly desirable and a much sought after transformation in both industrial chemistry and organic synthesis due to the wide ranging utility of these products as important precursors and intermediates [1][2][3][4]. However, synthetic work has become more challenging where greener concept of chemical synthesis are required to overcome problems such as long reaction times [5], expensive oxidants [6][7], toxic solvents [8][9] and the simplicity of the work up procedures.…”