Metalloporphyrins Catalyzed Oxidations

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Metalloporphyrins Catalyzed Oxidations

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Author : F. Montanari
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11

Metalloporphyrins Catalyzed Oxidations written by F. Montanari and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.

Oxidative catalysis by metalloporphyrin systems occupies a prominent role in the current research in the fields of chemical and biological catalysis. Our particular interest and approach has been to collect in the same volume papers dealing with both the chemical and biological aspects of the reactivity of heme systems because of the realization that a better understanding of the complementary discipline can be extremely useful for the researchers from either field. The current progress of the research on synthetic metalloporphyrin catalysts has led to the development of several systems that are able to reproduce the heme-enzyme mediated oxygenation and oxidation reactions, at least in terms of reaction types, mechanisms and often rates. These achievements have stimulated the of creating metalloporphyrin catalysts which are both ambitious project efficient and stable enough to become competitive for large-scale industrial processes. Although this project is still far from being realized, the efforts in this direction parallel those aimed at the application of heme enzymes to chemical technologies, e. g. for the mild, selective oxidation of organics or the detoxification of pollutants. Both the two approaches will be advantageous because while the enzyme systems can achieve selectivities which are probably unattainable by synthetic catalysts, the latter can be active under experimental conditions that would readily inactivate the enzymes.

Metalloporphyrins In Catalytic Oxidations

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Author : Roger A. Sheldon
language : en
Publisher: CRC Press
Release Date : 1994-06-28

Metalloporphyrins In Catalytic Oxidations written by Roger A. Sheldon and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-06-28 with Science categories.

This volume provides an in-depth overview of the chemistry of metalloporphyrins as oxidation catalysts in chemical and biological systems. It discusses practical techniques for the synthesis of metalloporphyrins and introduces useful methods of immobilization to improve their synthetic utility. Detailed discussions of underlying mechanistic features are provided.

Biomimetic Oxidations Catalyzed By Transition Metal Complexes

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Author : Bernard Meunier
language : en
Publisher: World Scientific
Release Date : 2000-03-08

Biomimetic Oxidations Catalyzed By Transition Metal Complexes written by Bernard Meunier and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-03-08 with Science categories.

Since the classic work Metal-Catalyzed Oxidations of Organic Compounds (edited by R A Sheldon and J K Kochi, 1991), no book has been devoted to advances in the field of biomimetic oxidations, which was created nearly 18 years ago. This expanding research field is covered in this volume. All the different aspects of the modeling of oxidations catalyzed by metalloenzymes are dealt with.This invaluable book will be useful to postgraduates as well as researchers in academia and industry, and will also benefit second year university students.

The Oxidation Of Hydrocarbons Catalyzed By Metalloporphyrins

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Author : Fu-Lung H. Lu
language : en
Publisher:
Release Date : 1984

The Oxidation Of Hydrocarbons Catalyzed By Metalloporphyrins written by Fu-Lung H. Lu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.

Studies In Catalytic Oxidations

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Author : Robert Burns Brown
language : en
Publisher:
Release Date : 1988

Studies In Catalytic Oxidations written by Robert Burns Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with AIDS (Disease) categories.

Oxidation Of Alkenes And Alkynes Catalyzed By A Cyclodextrin Modified Ketoester And Metalloporphyrins

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Author : Wing-Kei Chan
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-27

Oxidation Of Alkenes And Alkynes Catalyzed By A Cyclodextrin Modified Ketoester And Metalloporphyrins written by Wing-Kei Chan and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with categories.

This dissertation, "Oxidation of Alkenes and Alkynes Catalyzed by a Cyclodextrin-modified Ketoester and Metalloporphyrins" by Wing-kei, Chan, 陳永基, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled OXIDATION OF ALKENES AND ALKYNES CATALYZED BY A CYCLODEXTRIN-MODIFIED KETOESTER AND METALLOPORPHYRINS Submitted by Chan Wing Kei for the degree of Doctor of Philosophy at The University of Hong Kong in December 2005 Selective oxidation of alkenes and alkynes has been achieved using two classes of catalysts. The first one is cyclodextrin-modified ketoester (1b), which is an organocatalyst prepared by covalent attachment of a reactive ketone moiety to β-cyclodextrin. Treatment of 1b with Oxone as a terminal oxidant in situ generates a cyclodextrin dioxirane, which is able to effect stereoselective alkene epoxidation via inclusion complex formation in aqueous medium. The 1b-catalyzed (S)-α-terpineol epoxidations gave terpineol oxides in high yields, and the stereoselectivities (i.e., cis-: trans-epoxide ratio) decreased from 2.5: 1 to 1: 1.2 with increasing steric bulkiness of the terpenes. This steric-dependent stereoselectivity can be understood on the basis of different binding geometries of the 1b / terpene inclusion complexes according to H NMR titration and 2D ROESY experiments. Enantioselective epoxidation of styrenes has also been achieved with 1b as catalyst (20 - 50 mol%), and up to 40% ee was obtained. The second class of catalysts is metalloporphyrins. Highly diastereoselective epoxidations of allylic substituted alkenes including allylic alcohols, esters, and amines have been achieved using sterically bulky [Mn(2,6-ClTPP)Cl] and [Ru(2,6-Cl TPP)CO] [2,6-Cl TPP = meso-tetrakis(2,6-dichlorophenyl)porphyrin] as 2 2 catalysts. For cycloalkenes, trans-epoxides could be obtained in good yields (up to 99%) with up to >99: 1 trans-selectivity. For acyclic alkenes, up to 9: 1 erythro-selectivities for terminal allylic alkenes were achieved. It should be noted that such trans- and erythro-selectivities are the highest ones ever achieved in the literature. The synthetic utilities of this epoxidation method has been highlighted in stereoselective synthesis of key synthetic intermediates of anti-HIV drugs. Using [Mn(2,6-Cl TPP)Cl] as catalyst and Oxone as an oxidant, highly efficient and selective epoxidation reactions of steroids in high yields (up to 99%) with up to 30: 1 β-selectivity (TON up to 830) was achieved. The first example of catalytic epoxidation of flavones (92% isolated yield) (TON up to 620) has been attained using [Mn(F -TPP)Cl] [F -TPP = tetrakis(pentafluorophenyl)porphyrin] as catalyst. 20 20 The manganese porphyrin-catalyzed epoxidation method has been applied to stereoselective synthesis of β-acetylenosaccharides. A novel method for oxidative synthesis of amides from coupling of alkynes and amines using [Mn(2,6-Cl TPP)Cl] catalyst has been developed. A series of amides has been obtained in high yields (up to 96%) in aqueous medium. This method has been successfully applied to site-selective modification of peptides, which was characterized by MALDI-TOF and LC-MS/MS mass spectrometric analysis. DOI: 10.5353/th_b3670959 Subjects: Alkenes - Oxidation Alkynes - Oxidation Catalysis Porphyrins Esters

Catalytic Oxidation Of Dyes Using Metalloporphyrins As Catalysts And Hydrogen Peroxide As An Oxidant

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Author : Paul Anthony Stocks
language : en
Publisher:
Release Date : 1995

Catalytic Oxidation Of Dyes Using Metalloporphyrins As Catalysts And Hydrogen Peroxide As An Oxidant written by Paul Anthony Stocks and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

Studies Of The Oxidation Chemistry Of Metalloporphyrins And N Alkyl Metalloporphyrins

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Author : Charles Raymond Cornman
language : en
Publisher:
Release Date : 1990

Studies Of The Oxidation Chemistry Of Metalloporphyrins And N Alkyl Metalloporphyrins written by Charles Raymond Cornman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.

The Porphyrin Handbook Volume 4

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Author : Karl Kadish
language : en
Publisher: Elsevier
Release Date : 2000

The Porphyrin Handbook Volume 4 written by Karl Kadish and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Science categories.

How I Feel books help children ages 2-6 recognize and identify their emotions and give them a vocabulary to describe what they are feeling. If children can name an emotion, they are on their way to understanding it. And when children can talk about what they are feeling, their parents will be better able to help them.Features: -- 8 x 8 24-page hardcover or -- softcover full-color picture book -- Each book includes an activity card and reusable stickers -- Question-answer format stimulates conversation between parent and child

The Catalytic Effect Of Metalloporphyrins In Selective Oxidation Of Cyclohexane

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Author : X. Wang
language : en
Publisher:
Release Date : 1981

The Catalytic Effect Of Metalloporphyrins In Selective Oxidation Of Cyclohexane written by X. Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.