Aerobic oxidation of α,β-unsaturated alcohols using sequentially-grown AuPd nanoparticles in water and tetraalkylphosphonium ionic liquids

Liquid phase oxidation of cinnamyl alcohol to cinnamaldehyde using multiwall carbon nanotubes decorated with zinc-manganese oxide nanoparticles

“…A bimetallic Pt-Bi catalyst supported on activated carbon in the presence of hydrogen peroxide has been used, which showed better selectivity (84%), but poor conversion (34%) [9]. Scott et al, utilized metallic and bimetallic nanocrystal as a catalysts in aqueous medium and achieved ~34% conversion [10]. Similarly, Pt or palladium (Pd) catalysts with comparable results have also been utilized [8,[11][12][13].…”

Copper/Imidazolium/TEMPO-Catalyzed Aerobic Oxidation of Benzylic Alcohols­ in Water

“…[1][2][3] Aqueous reactions are especially important for oxidation processes since reactions that are possibly explosive under oxidation conditions can be avoided. [4][5][6][7] N-Heterocyclic carbenes (NHCs) represent appropriate ligands for aqueous metalcatalyzed oxidation reactions since metal complexes of NHCs show high thermal, air, and moisture stability. [8][9][10] Although water-soluble NHC complexes have been explored as catalysts in a number of C-C coupling reactions, their application as an oxidation catalyst is not previously known.…”

Metal oxide and bimetallic nanoparticles in ionic liquids: synthesis and application in multiphase catalysis

“…(NH 4 ) 2 PdCl 6 dissolved in the aqueous phase was reduced at 45 ° C by the hydroxyl group of the emulsifying agent Triton X-100. Subsequently, HAuCl 4 dissolved in [C 4 C 1 Im] [PF 6 ] was reduced on the surface of the Pd cores, provoking the temporary release of Pd 2 + , which was subsequently reduced yet again on the surface of the NPs [46] . Santini ' s group has also reported the synthesis of bimetallic Ru-Ta NPs using Ru(COD)(COT) and Tris(neopentyl) neopentylidene tantalum(V) (TaNp 3 = Np) as precursors [88] .…”

“…In their ongoing studies about bimetallic Au-Pd NPs in ILs, Scott et al found that these materials are suitable for the oxidation of α , β -unsaturated alcohols (Scheme 5 ) [46] . Besides PVP-stabilized bimetallic particles, the authors evaluated tetraalkylphosphonium chloride ILs as stabilizers during the sequential reduction of the metal precursors yielding a variety of core-shell particles.…”

“…However, only few reports exist on metal oxides and bimetallic alloy or core-shell NPs in ILs, as precursors and/or catalysts for transformations in multiphase systems [13, 32 -55] . Their potential applications cover such fields as hydrogenation reactions [32,33,36,40,45] , hydrogenolysis [39,56] , C-C coupling [41] , C-C bond cleavage [13] , dehalogenation of arenes [55] , condensation reactions [54] , oxidation [46] , as well as electrochemical applications [42, 47, 51 -53, 57, 58] . The scope of the present review is to discuss the mentioned traditional catalytic applications, excluding electrochemical applications.…”