Functionalization of graphene oxide with a hybrid P, N ligand for immobilizing and stabilizing economical and non-toxic nanosized CuO: an efficient, robust and reusable catalyst for the C–O coupling reaction inO-arylation of phenol

Abstract

Herein, we report a promising graphene oxide (GO) anchored robust and thermally stable heterogeneous catalytic system containing the low cost and less toxic copper oxide as a catalytic active material...

Click chemistry in the synthesis of catalytically relevant organoselenium compounds: development and applications of catalysts for organic synthesis

“…An in-depth study on mechanism of their role in catalysis is yet to be carried out. It is envisaged that these systems have huge application possibilities in the catalysis of other chemical transformations (such as C-O coupling reactions) 69,71 and electrocatalysis. An extensive work may be carried out in near future on the exploration of the potential of click generated ligands (having S/Se/Te donor) in the development of heterogeneous and nanocatalysts.…”

Organosulphur and organoselenium compounds as emerging building blocks for catalytic systems forO-arylation of phenols, a C–O coupling reaction

“…Organosulphur, organoselenium and organophosphorous ligands have been found to show interesting effects on the efficiency of nanocatalysts. 57 is a nanocatalyst 200 which has a covalently grafted hybrid P, N ligand (i.e., Ph 2 P-CH 2 -CH 2 -NH 2 ) on the graphene oxide (GO). The ligand immobilizes and stabilizes CuO nanoparticles (Scheme 54) in the catalyst.…”

“…The ligand immobilizes and stabilizes CuO nanoparticles (Scheme 54) in the catalyst. 200 However, 54 has Cu 1.8 S nanoflowers, anchored on GO. The stability of 57 is very high due to existence of the covalent linkages between the sheets of graphene oxide and -NH 2 -CH 2 -CH 2 -PPh 2 (i.e., the ligand).…”

“…60 On the other hand, 57 shows only 71% yield with the same substrate in 12 hours with 20 mg catalyst. 200 The high activity of 54 is mainly due to the presence of the synergistic effects of nanoflowers of Cu 1.8 S with the graphene oxide. The contribution of high surface area may also be an additional factor behind its superiority in terms of activity.…”

Molecular Organosulphur, Organoselenium and Organotellurium Complexes as Homogeneous Transition Metal Catalytic Systems for Suzuki Coupling

“…Though interesting findings have come into existence in the field of catalysis of coupling reactions [166][167][168][169][170][171][172][173][174][175][176][177][178][179] with palladium and nickel complexes of organosulphur and organoselenium ligands, the use of organotellurium ligands in catalyst development for this reaction is very limited. Hence, there lies a gap which may be filled by exploring the use of a variety of organotellurium compounds in catalyst development.…”