Metal-Catalyzed Epoxidations of Alkenes with Hydrogen Peroxide

ChemInform ◽  
2003 ◽  
Vol 34 (38) ◽  
Author(s):  
Benjamin S. Lane ◽  
Kevin Burgess
Keyword(s):  
Hydrogen Peroxide ◽  
Metal Catalyzed

scholarly journals Metal-catalyzed oxidation renders silver intensification selective. Applications for the histochemistry of diaminobenzidine and neurofibrillary changes.

1986 ◽  
Vol 34 (12) ◽  
pp. 1667-1672 ◽  
Author(s):  
F Gallyas ◽  
J R Wolff
Keyword(s):  
Hydrogen Peroxide ◽  
Oxidative Polymerization ◽  
Silver Coating ◽  
Neurofibrillary Changes ◽  
Iodide Ions ◽  
Tissue Sections ◽  
Metal Catalyzed Oxidation ◽  
Pre Treatment ◽  
Metal Catalyzed ◽  
Catalyzed Oxidation

Physical developers can increase the visibility of end products of certain histochemical reactions, such as oxidative polymerization of diaminobenzidine and selective binding of complex silver iodide ions to Alzheimer's neurofibrillary changes. Unfortunately, this intensification by silver coating is generally superimposed on a nonspecific staining originating from the argyrophil III reaction, which also takes place when tissue sections are treated with physical developers. The present study reveals that the argyrophil III reaction can be suppressed when tissue sections are treated with certain metal ions and hydrogen peroxide before they are transferred to the physical developer. The selective intensification of Alzheimer's neurofibrillary changes requires a pre-treatment with lanthanum nitrate (10 mM/liter) and 3% hydrogen peroxide for 1 hr. The diaminobenzidine reaction can be selectively intensified when physical development is preceded by consecutive treatments with copper sulfate (10 mM/liter, pH 5, 10 min) and hydrogen peroxide (3%, pH 7, 10 min). In peroxidase histochemistry, this high-grade intensification may help to increase specificity and reduce the threshold of detectability in tracing neurons with horseradish peroxidase or in immunohistochemistry when the peroxidase-antiperoxidase method is used.

ChemInform Abstract: Metal-Catalyzed Asymmetric Sulfoxidation, Epoxidation and Hydroxylation by Hydrogen Peroxide

ChemInform ◽  
2015 ◽  
Vol 46 (4) ◽  
pp. no-no
Author(s):  
Hassan Srour ◽  
Paul Le Maux ◽  
Soizic Chevance ◽  
Gerard Simonneaux
Keyword(s):  
Hydrogen Peroxide ◽  
Metal Catalyzed

scholarly journals Investigation of the effect of organic solvents on kinetic parameters in metal catalyzed reactions

2000 ◽  
Vol 65 (3) ◽  
pp. 201-206
Author(s):  
Ljiljana Trifkovic ◽  
Gordana Milovanovic
Keyword(s):  
Hydrogen Peroxide ◽  
Kinetic Parameters ◽  
Acid Oxidation ◽  
Carminic Acid ◽  
Pyrocatechol Violet ◽  
Free Activation Energy ◽  
S Oxidation ◽  
Catalyzed Reactions ◽  
Metal Catalyzed ◽  
Oxidation By Hydrogen Peroxide

The effects of acetone and acetonitrile on the kinetic parameters of azorubin S oxidation by hydrogen peroxide catalyzed by manganese(II), pyrocatechol violet oxidation by hydrogen peroxide catalyzed by copper(II), and carminic acid oxidation by hydrogen peroxide catalyzed by copper(II) and activated by bifenox, were examined. It was established that the examined solvents exhibit various effects on the kinetic parameters of the above said reactions. In all instances a change in the solvent concentration affects both the enthalpy and the entropy contributions to the free activation energy during the transition of the system into the active state, as well as the constant of the active complex formed at this point.

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