Cobalt(II) Schiff base catalyzed biomimetic oxidation of organic substrates with dioxygen

Punniyamurthy, Tharmalingam; Reddy, M. Madhava; Kalra, Swinder Jeet Singh; Iqbal, Javed

doi:10.1351/pac199668030619

Cited by 38 publications

(14 citation statements)

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“…The coordination geometry around the molybdenum center in these complexes can be best described as a distorted octahedron in which the ONO tridentate ligand occupies a meridional position with two anionic oxygen donors mutually trans and cis to the oxygen centers of the cis ‐dioxo group. Most applications of cis ‐MoO 2 (ONO)‐type complexes reported in the literature involve oxo transfer reactions like epoxidation, sulfoxidation and phosphine oxidation reactions …”

Section: Dioxygen Coordinationmentioning

confidence: 99%

Synthesis and antioxidant activities of Schiff bases and their complexes: a review

Zoubi

Al‐Hamdani

Kaseem

2016

Applied Organom Chemis

202

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Schiff bases, named after https://en.wikipedia.org/wiki/Hugo_Schiff, are aldehyde‐ or ketone‐like compounds in which the carbonyl group is replaced by imine or azomethine group. They are widely used for industrial purposes and also have a broad range of applications as antioxidants. An overview of antioxidant applications of Schiff bases and their complexes is discussed in this review. A brief history of the synthesis and reactivity of Schiff bases and their complexes is presented. Factors of antioxidants are illustrated and discussed. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Dioxygen Coordinationmentioning

confidence: 99%

Synthesis and antioxidant activities of Schiff bases and their complexes: a review

Zoubi

Al‐Hamdani

Kaseem

2016

Applied Organom Chemis

202

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“…The active oxo‐Cu species subsequently reacts with alkanes through CH bond activation and OH rebound to form the desired alcohol or the corresponding ketone. Various Co II Schiff base complexes have been also examined in the aerobic oxidation of alkanes in the presence of aldehydes as reducing agents 47…”

Section: Oxidation Of Non‐activated Sp3 Ch Bonds In Alkanes and Cmentioning

confidence: 99%

“…The hydroxylation of adamantane and cyclohexane by O 2 in the presence of dinuclear Fe II macrocyclic complexes 12 or 13 and H 2 S which serves as both electron and proton donor was reported 50. The oxidation of adamantane gave only hydroxylation products, and TONs show that these macrocyclic Fe complexes are more effective for the hydroxylation of cyclohexane than μ‐oxo binuclear Fe complexes 47. Metalloporphyrins bearing meso ‐pentafluorophenyl groups51 and the chlorinated phthalocyanine Fe II complex 14 52 are efficient catalysts for the aerobic oxidation of alkanes with acetaldehyde.…”

Section: Oxidation Of Non‐activated Sp3 Ch Bonds In Alkanes and Cmentioning

confidence: 99%

Selective Catalytic Oxidation of CH Bonds with Molecular Oxygen

et al. 2012

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Although catalytic reductions, cross‐couplings, metathesis, and oxidation of CC double bonds are well established, the corresponding catalytic hydroxylations of CH bonds in alkanes, arenes, or benzylic (allylic) positions, particularly with O2, the cheapest, “greenest”, and most abundant oxidant, are severely lacking. Certainly, some promising examples in homogenous and heterogenous catalysis exist, as well as enzymes that can perform catalytic aerobic oxidations on various substrates, but these have never achieved an industrial‐scale, owing to a low space‐time‐yield and poor stability. This review illustrates recent advances in aerobic oxidation catalysis by discussing selected examples, and aims to stimulate further exciting work in this area. Theoretical work on catalyst precursors, resting states, and elementary steps, as well as model reactions complemented by spectroscopic studies provide detailed insight into the molecular mechanisms of oxidation catalyses and pave the way for preparative applications. However, O2 also poses a safety hazard, especially when used for large scale reactions, therefore sophisticated methodologies have been developed to minimize these risks and to allow convenient transfer onto industrial scale.

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“…Transition-metal complexes of Schiff-bases are becoming increasingly important as biochemical, analytical, antimicrobial, and anticancer agent reagents [33][34][35][36][37][38]. It is also well known that Zn is useful to reduce the cardio-and epatotoxicity induced by some anticancer drugs [39].…”

Section: Introductionmentioning

confidence: 99%

Preparation of low-molecular-weight chitosan derivative zinc complexes and their effect on the growth of liver cancer cells in vitro

Wang

Song

et al. 2009

Pure and Applied Chemistry

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Low-molecular-weight (LMW) chitosan salicylaldehyde Schiff-base and its zinc(II) complexes were synthesized and characterized by Fourier transform-infrared (FT-IR) spectra, transmission electron microscopy (TEM), dynamic light scattering (DLS), gel permeation chromatography-multiangle laser light scattering (GPC-MALLS), and elemental analysis. The results of electrophoretic analysis suggest that the Zn complexes bound to DNA by means of electrostatic interactions and intercalation. The effect of the Zn complexes on the growth of SMMC-7721 liver cancer cells was investigated by sulforhodamine B assay in vitro. The results reveal that the growth of liver cancer cells was inhibited by LMW-chitosan and their Zn complexes. The inhibition rate of the Zn complexes was higher than that of LMW-chitosan ligand. The LMW-chitosan Schiff-base Zn complex exhibited higher anticancer activity than the LMW-chitosan Zn complex. Combining LMW-chitosan with Schiffbase and Zn improved its anticancer activity, which we ascribe to the synergistic effect between the chitosan matrix and the planar construction of the Zn complexes.

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Cobalt(II) Schiff base catalyzed biomimetic oxidation of organic substrates with dioxygen

Abstract: Abstract

Cited by 38 publications

References 0 publications

Synthesis and antioxidant activities of Schiff bases and their complexes: a review

Synthesis and antioxidant activities of Schiff bases and their complexes: a review

Selective Catalytic Oxidation of CH Bonds with Molecular Oxygen

Preparation of low-molecular-weight chitosan derivative zinc complexes and their effect on the growth of liver cancer cells in vitro

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