Threitol-Strapped Manganese Porphyrins as Enantioselective Epoxidation Catalysts of Unfunctionalized Olefins

1995 ◽  
Vol 117 (2) ◽  
pp. 692-703 ◽  
Author(s):  
James P. Collman ◽  
Virgil J. Lee ◽  
Cynthia J. Kellen-Yuen ◽  
Xumu Zhang ◽  
James A Ibers ◽  
...  
Keyword(s):  
Manganese Porphyrins ◽  
Enantioselective Epoxidation

Enantioselective epoxidation of unfunctionalized olefins catalyzed by threitol-strapped manganese porphyrins

1993 ◽  
Vol 115 (9) ◽  
pp. 3834-3835 ◽  
Author(s):  
James P. Collman ◽  
Virgil J. Lee ◽  
Xumu Zhang ◽  
James A. Ibers ◽  
John I. Brauman
Keyword(s):  
Manganese Porphyrins ◽  
Enantioselective Epoxidation

ChemInform Abstract: Enantioselective Epoxidation of Unfunctionalized Olefins Catalyzed by Threitol-Strapped Manganese Porphyrins.

ChemInform ◽  
2010 ◽  
Vol 24 (36) ◽  
pp. no-no
Author(s):  
J. P. COLLMAN ◽  
V. J. LEE ◽  
X. ZHANG ◽  
J. A. IBERS ◽  
J. I. BRAUMAN
Keyword(s):  
Manganese Porphyrins ◽  
Enantioselective Epoxidation

Magnetic properties of new charge-transfer complexes based on manganese porphyrins

1997 ◽  
Vol 90 (3) ◽  
pp. 407-413
Author(s):  
MARC KELEMEN ◽  
CHRISTOPH WACHTER ◽  
HUBERT WINTER ◽  
ELMAR DORMANN ◽  
RUDOLF GOMPPER ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Manganese Porphyrins

scholarly journals Enabling Highly (R)-Enantioselective Epoxidation of Styrene by Engineering Unique Non-Natural P450 Peroxygenases

2021 ◽  
Author(s):  
Panxia Zhao ◽  
Jie Chen ◽  
Nana Ma ◽  
Jingfei Chen ◽  
Xiangquan Qin ◽  
...  
Keyword(s):  
Styrene Monooxygenase ◽  
Enantioselective Epoxidation

Unlike the excellent (S)-enantioselective epoxidation of styrene performed by natural styrene monooxygenase (ee >99%), the (R)-enantioselective epoxidation of styrene has not yet achieved a comparable efficiency using natural or engineered...

Chiral urea-catalyzed enantioselective epoxidation of α, β-unsaturated esters

2021 ◽  
Vol 68 ◽  
pp. 152909
Author(s):  
Nan Ji ◽  
Qinqin Tian ◽  
Qingqing Yang ◽  
Minghua Li ◽  
Wei He
Keyword(s):  
Unsaturated Esters ◽  
Enantioselective Epoxidation

scholarly journals Effects of Manganese Porphyrins on Cellular Sulfur Metabolism

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 980 ◽  
Author(s):  
Kenneth R. Olson ◽  
Yan Gao ◽  
Andrea K. Steiger ◽  
Michael D. Pluth ◽  
Charles R. Tessier ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Biological Effects ◽  
Sulfur Metabolism ◽  
Hek293 Cells ◽  
Redox Cycle ◽  
Major Site ◽  
Manganese Porphyrins ◽  
Short And Long Term ◽  
H2s Production

Manganese porphyrins (MnPs), MnTE-2-PyP5+, MnTnHex-2-PyP5+ and MnTnBuOE-2-PyP5+, are superoxide dismutase (SOD) mimetics and form a redox cycle between O2 and reductants, including ascorbic acid, ultimately producing hydrogen peroxide (H2O2). We previously found that MnPs oxidize hydrogen sulfide (H2S) to polysulfides (PS; H2Sn, n = 2–6) in buffer. Here, we examine the effects of MnPs for 24 h on H2S metabolism and PS production in HEK293, A549, HT29 and bone marrow derived stem cells (BMDSC) using H2S (AzMC, MeRho-AZ) and PS (SSP4) fluorophores. All MnPs decreased intracellular H2S production and increased intracellular PS. H2S metabolism and PS production were unaffected by cellular O2 (5% versus 21% O2), H2O2 or ascorbic acid. We observed with confocal microscopy that mitochondria are a major site of H2S production in HEK293 cells and that MnPs decrease mitochondrial H2S production and increase PS in what appeared to be nucleoli and cytosolic fibrillary elements. This supports a role for MnPs in the metabolism of H2S to PS, the latter serving as both short- and long-term antioxidants, and suggests that some of the biological effects of MnPs may be attributable to sulfur metabolism.

Enantioselective Epoxidation of Olefins with H2O2 Catalyzed by Bioinspired Aminopyridine Manganese Complexes

2016 ◽  
Vol 18 (3) ◽  
pp. 372-375 ◽  
Author(s):  
Duyi Shen ◽  
Bin Qiu ◽  
Daqian Xu ◽  
Chengxia Miao ◽  
Chungu Xia ◽  
...  
Keyword(s):  
Manganese Complexes ◽  
Enantioselective Epoxidation ◽  
Epoxidation Of Olefins
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