Ammonium acetate as a very simple and efficient cocatalyst for manganese porphyrin-catalysed oxygenation of hydrocarbons by hydrogen peroxide

1994 ◽  
pp. 1035 ◽  
Author(s):  
Annie Thellend ◽  
Pierrette Battioni ◽  
Daniel Mansuy
Keyword(s):  
Hydrogen Peroxide ◽  
Ammonium Acetate ◽  
Manganese Porphyrin

Oxidation of alkylaromatics with hydrogen peroxide catalysed by manganese(III) porphyrins in the presence of ammonium acetate

2003 ◽  
Vol 201 (1-2) ◽  
pp. 9-22 ◽  
Author(s):  
Susana L.H Rebelo ◽  
Mário M.Q Simões ◽  
M.Graça P.M.S Neves ◽  
José A.S Cavaleiro
Keyword(s):  
Hydrogen Peroxide ◽  
Ammonium Acetate

scholarly journals Hydrogen peroxide-mediated synthesis of 2,4-substituted quinazolines via one-pot three-component reactions under metal-free conditions

RSC Advances ◽  
2020 ◽  
Vol 10 (50) ◽  
pp. 29900-29909
Author(s):  
Khang H. Trinh ◽  
Khang X. Nguyen ◽  
Phuc H. Pham ◽  
Tung T. Nguyen ◽  
Anh N. Q. Phan ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ammonium Acetate ◽  
One Pot ◽  
Metal Free ◽  
Three Component Reaction

An efficient metal-free synthesis of 2,4-substituted quinazolines via a hydrogen peroxide-mediated one-pot three-component reaction of 2-aminoaryl ketones, aldehydes, and ammonium acetate has been developed.

scholarly journals Biomimetic oxidation of carbamazepine with hydrogen peroxide catalyzed by a manganese porphyrin

Química Nova ◽  
2012 ◽  
Vol 35 (7) ◽  
pp. 1477-1481 ◽  
Author(s):  
Cláudia M. B. Neves ◽  
Mário M. Q. Simões ◽  
Fernando M. J. Domingues ◽  
M. Graça P. M. S. Neves ◽  
José A. S. Cavaleiro
Keyword(s):  
Hydrogen Peroxide ◽  
Manganese Porphyrin ◽  
Biomimetic Oxidation

Hydrogen peroxide as oxidant in bio-mimetic catalysis by manganese porphyrin: Theoretical DFT studies

2013 ◽  
Vol 91 (7) ◽  
pp. 642-647 ◽  
Author(s):  
Agnieszka Drzewiecka-Matuszek ◽  
Dorota Rutkowska-Zbik ◽  
Malgorzata Witko
Keyword(s):  
Hydrogen Peroxide ◽  
Density Functional ◽  
Active Oxygen Species ◽  
Dft Method ◽  
Manganese Porphyrin ◽  
Functional Theory ◽  
Interatomic Distances ◽  
The Density Functional Theory ◽  
Spin Populations ◽  
Spin Densities

The aim of this study is to elucidate the geometry and electronic structure of various adducts that may be formed between manganese(III) (Mn(III)) porphyrin and hydrogen peroxide. Hydrogen peroxide may interact with Mn(III) porphyrin either as H2O2 or, after dissociation, as OOH–. In the former, it may decompose into two hydroxo groups, which acquire OH– character or an oxo group (=O) and a water molecule. Therefore, the following systems are considered: MnP(H2O2)+, MnP(H2O2)(OH), MnP(OH)3, [Formula: see text], MnPO+, MnPO(OH), MnP(OOH), MnP(OOH)(OH)–, and the possible transformations between them are taken into account. The reported studies are performed within the Density Functional Theory (DFT) method with the GGA-BP functional. The geometry and electronic structures of the structures found along the studied reaction pathways are discussed in terms of interatomic distances, valence angles, Mulliken charges, and spin densities. It was found that different active oxygen species may be formed in the reaction between Mn(III) porphyrin and hydrogen peroxide. As manganese is a transition metal, numerous possible spin states for each of the studied structures are found, where the relative energies of different multiplicities depend strongly on the ligands present in the complex. In view of the catalytic properties, all oxygen-containing ligands are negatively charged, which results in their behaviour as nucleophiles towards hydrocarbons. Finally, the analysis of charge and spin populations on different parts of the studied systems indicate the porphyrin ligand as active in charge transfer processes.

Peroxidase Localization in Hartmanella Trophozoites

1971 ◽  
Vol 29 ◽  
pp. 346-347 ◽  
Author(s):  
George E. Childs ◽  
Joseph H. Miller
Keyword(s):  
Hydrogen Peroxide ◽  
Ultrastructural Localization ◽  
Pathogenic Strain ◽  
Oxidative Enzymes ◽  
Differential Centrifugation ◽  
Electron Microscopic ◽  
Microscopic Studies ◽  
The Subject ◽  
Axenic Cultures

Biochemical and differential centrifugation studies have demonstrated that the oxidative enzymes of Acanthamoeba sp. are localized in mitochondria and peroxisomes (microbodies). Although hartmanellid amoebae have been the subject of several electron microscopic studies, peroxisomes have not been described from these organisms or other protozoa. Cytochemical tests employing diaminobenzidine-tetra HCl (DAB) and hydrogen peroxide were used for the ultrastructural localization of peroxidases of trophozoites of Hartmanella sp. (A-l, Culbertson), a pathogenic strain grown in axenic cultures of trypticase soy broth.

The structure of pre-mRNA and mRNA from erythroid cells

1978 ◽  
Vol 36 (2) ◽  
pp. 234-235
Author(s):  
A.-M. Ladhoff ◽  
B.J. Thiele ◽  
Ch. Coutelle ◽  
S. Rosenthal
Keyword(s):  
Bone Marrow ◽  
Structural Transformation ◽  
Electron Micrographs ◽  
Ammonium Acetate ◽  
Bone Marrow Cells ◽  
Erythroid Cells ◽  
Globin Mrna ◽  
Ordered Structures ◽  
Rabbit Bone ◽  
Rabbit Reticulocytes

The suggested precursor-product relationship between the nuclear pre-mRNA and the cytoplasmic mRNA has created increased interest also in the structure of these RNA species. Previously we have been published electron micrographs of individual pre-mRNA molecules from erythroid cells. An intersting observation was the appearance of a contour, probably corresponding to higher ordered structures, on one end of 10 % of the pre-mRNA molecules from erythroid rabbit bone marrow cells (Fig. 1A). A virtual similar contour was observed in molecules of 9S globin mRNA from rabbit reticulocytes (Fig. 1B). A structural transformation in a linear contour occurs if the RNA is heated for 10 min to 90°C in the presence of 80 % formamide. This structural transformation is reversible when the denatured RNA is precipitated and redissolved in 0.2 M ammonium acetate.

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