Highly Chemoselective and Enantioselective Catalytic Oxidation of Heteroaromatic Sulfides via High-Valent Manganese(IV)–Oxo Cation Radical Oxidizing Intermediates

ACS Catalysis ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 4890-4895 ◽  
Author(s):  
Wen Dai ◽  
Sensen Shang ◽  
Ying Lv ◽  
Guosong Li ◽  
Chunsen Li ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Cation Radical ◽  
High Valent

Mechanistic Insight into the Aromatic Hydroxylation by High-Valent Iron(IV)-oxo Porphyrin π-Cation Radical Complexes

2007 ◽  
Vol 72 (16) ◽  
pp. 6301-6304 ◽  
Author(s):  
Min-Jung Kang ◽  
Woon Ju Song ◽  
Ah-Rim Han ◽  
Young S. Choi ◽  
Ho G. Jang ◽  
...  
Keyword(s):  
Cation Radical ◽  
Mechanistic Insight ◽  
Aromatic Hydroxylation ◽  
High Valent ◽  
Insight Into

Biomimetic Alkane Hydroxylations by an Iron(III) Porphyrin Complex with H2O2and by a High-Valent Iron(IV) Oxo Porphyrin Cation Radical Complex

1999 ◽  
Vol 38 (13) ◽  
pp. 3238-3240 ◽  
Author(s):  
Wonwoo Nam ◽  
Yeong Mee Goh ◽  
Yoon Jung Lee ◽  
Mi Hee Lim ◽  
Cheal Kim
Keyword(s):  
Cation Radical ◽  
Porphyrin Complex ◽  
Radical Complex ◽  
High Valent ◽  
Porphyrin Cation

High-valent iron porphyrins

2000 ◽  
Vol 04 (04) ◽  
pp. 344-349 ◽  
Author(s):  
AVRAM GOLD ◽  
RAYMOND WEISS
Keyword(s):  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
Variable Temperature ◽  
Cation Radical ◽  
Iron Porphyrins ◽  
Compound I ◽  
X Ray ◽  
High Valent ◽  
X Ray Absorption ◽  
Circular Dichroïsm

The term ‘high-valent’ refers to iron complexes of porphyrins and related macrocycles in which the oxidation state of the iron center exceeds III. High-valent iron porphyrins and chlorins are important biological transients whose intermediacy has been demonstrated in numerous peroxidase and catalase enzymes. Two species, compounds I and II, are spectroscopically detectable upon stoichiometric addition of monooxygen donors to resting ferric enzymes. Compounds I and II are formally two and one oxidizing equivalents respectively above the ferric state. In compound II the oxidizing equivalent has been shown by spectroscopic studies to be located on iron as an oxoiron(IV) unit. The spectroscopic and magnetic properties of compound I support the structural assignment of an S = 1 oxoiron(IV) unit magnetically coupled to a heme π-cation radical (S = 1/2). Studies on model hemes have contributed much to the understanding of protein chemistry. Much work has been accomplished with meso-tetaarylporphyrins and, more recently, with physiologically congruent meso-unsubstituted pyrrole β-substituted complexes. Compounds I of both proteins and synthetic models have been characterized by a wide array of spectroscopic methods, including UV-vis, NMR, resonance Raman, EPR, variable-temperature/variable-field magnetic Mössbauer, magnetic circular dichroism and extended X-ray absorption fine structure spectroscopy. Results of these studies are summarized. Recent developments, which promise to yield a detailed picture of electronic structure, are variable-temperature magnetic circular dichroism, studies in the pre-K-edge region and L-edge X-ray absorption spectroscopy. Time-resolved X-ray diffraction techniques have been applied to obtain the first structural data on the protein forms of compound I.

ChemInform Abstract: A High-Valent Iron(IV) Oxo Porphyrin Cation Radical Complex in Olefin Epoxidation Reactions.

ChemInform ◽  
2010 ◽  
Vol 30 (10) ◽  
pp. no-no
Author(s):  
Yoon Jung Lee ◽  
Cheal Kim ◽  
Youngah Kim ◽  
So-Yeop Han ◽  
Wonwoo Nam
Keyword(s):  
Cation Radical ◽  
Olefin Epoxidation ◽  
Radical Complex ◽  
High Valent ◽  
Porphyrin Cation

A heterogeneous bio-inspired peroxide shunt for catalytic oxidation of organic molecules

2020 ◽  
Vol 56 (78) ◽  
pp. 11593-11596
Author(s):  
Manjistha Mukherjee ◽  
Abhishek Dey
Keyword(s):  
Catalytic Oxidation ◽  
Organic Molecules ◽  
Gold Electrodes ◽  
Iron Porphyrins ◽  
Self Assembled Monolayer ◽  
Axial Ligands ◽  
Self Assembled ◽  
High Valent

Iron porphyrins with three different axial ligands installed atop self-assembled monolayer modified gold electrodes can oxidize C–H bonds and epoxidize alkenes efficiently using H2O2via the formation of a high-valent intermediate.

Sign in / Sign up

Export Citation Format

Share Document