Direct oxidation of amines to nitriles in the presence of ruthenium-terpyridyl complex immobilized on ILs/SILP

Abstract

Ru2Cl4(az-tpy)2 was immobilized within a range of supported ionic liquids on silica. SILP operates as an efficient heterogeneous catalyst in oxidation of long chain linear primary amines to corresponding nitriles.

SCILLs as selective catalysts for the oxidation of aromatic alcohols

“…The higher activity for the 5wt% Pt/OMS-2/[Bmpyr][NTf2] in the presence of 25 atm 20% O2 in N2 compared with the 5 atm of 100% O2 indicates that the presence of diluent gas can affect the conversion and selectivity observed. This behavior has been observed previously [64]. In order to establish the influence of the inert gas on the catalytic activity of the SCILL catalysts, reactions in the presence of different inert (He, Ar, N2) or reactive CO2 gas mixtures were performed.…”

Ruthenium‐Catalyzed Aerobic Oxidation of Amines

“…Additionally, a strong dependence on the alkyl chain length of the reactant was observed with respect to the conversion. This was followed by another report from the same group where they immobilized the same Ru 2 Cl 4 (az‐tpy) 2 complexes on ionic liquid dispersed silica (SILP; Table ) to produce an efficient heterogeneous catalyst for the oxidation of long chain linear primary amines to the corresponding nitriles …”

“…Numerous heterogeneous ruthenium systems have also been reported for the production of nitriles and imines. [48][49][50][55][56][57][58][59][60] Kaneda et al reported am onomeric Ru 3 + species bound to ah ydroxyapatite surface (Ru/HAP), which acts as an efficient catalyst for the aerobic oxidationo fp rimary amines to nitriles (entry 1, Ta ble 3). [48] It showed ag ood functional group tolerance, and both aromatic and aliphatic amines were oxidizedu nder mild reactionc onditions in the presence of molecular oxygen as the sole oxidant.…”

“…This was followed by another reportf rom the same group where they immobilized the same Ru 2 Cl 4 (az-tpy) 2 complexes on ionic liquid dispersed silica( SILP;T able 3) to produce an efficient heterogeneous catalystf or the oxidationo fl ong chain linear primary amines to the corresponding nitriles. [57] Mechanistic aspects of ruthenium-catalyzed dehydrogenation of amines Mizuno etal. carried out ad etailed mechanistic study to reveal the plausible mechanism involved in Ru(OH) 3 /Al 2 O 3 catalyzed oxidative dehydrogenation of amines to nitriles or imines (Scheme 8).…”

Heterocyclic bismuth(iii) compounds with transannular N→Bi interactions as catalysts for the oxidation of thiophenol to diphenyldisulfide

“…This is in good agreement with previous reports on the stabilizing capacity of ILs in various catalytic reactions. 58 Literature reported several mechanisms for this reaction. Based on EPR measurements Corma et al concluded that on oxide heterogeneous catalysts the reaction is controlled by a radical pathway implying a homolytic S-H scission from the original thiol.…”