scholarly journals Kinetics of Hydrogen Atom Abstraction from Substrate by an Active Site Thiyl Radical in Ribonucleotide Reductase

2014 ◽  
Vol 136 (46) ◽  
pp. 16210-16216 ◽  
Author(s):  
Lisa Olshansky ◽  
Arturo A. Pizano ◽  
Yifeng Wei ◽  
JoAnne Stubbe ◽  
Daniel G. Nocera
Keyword(s):  
Hydrogen Atom ◽  
Ribonucleotide Reductase ◽  
Active Site ◽  
Hydrogen Atom Abstraction ◽  
Thiyl Radical ◽  
Kinetics Of

Reaction kinetics of hydrogen atom abstraction from isopentanol by the H atom and HO2˙ radical

2018 ◽  
Vol 20 (16) ◽  
pp. 10895-10905
Author(s):  
Prajakta Rajaram Parab ◽  
K. Alexander Heufer ◽  
Ravi Xavier Fernandes
Keyword(s):  
Hydrogen Atom ◽  
Transition State ◽  
Reaction Kinetics ◽  
Hydrogen Atom Abstraction ◽  
Abstraction Reaction ◽  
Kinetics Of ◽  
Ho2 Radical

The formation of the transition state for the H-abstraction reaction from isopentanol by the HO2˙ radical.

Ab initio-based kinetics of hydrogen atom abstraction from methyl propionate by H and CH3 radicals: a biodiesel model

2021 ◽  
Author(s):  
Jamelah S. Al-Otaibi ◽  
Mohamed A. M. Mahmoud ◽  
Aljawhara H. Almuqrin ◽  
Tarek M. El-Gogary ◽  
Mohamed A. Abdel-Rahman ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Ab Initio ◽  
Hydrogen Atom Abstraction ◽  
Methyl Propionate ◽  
Kinetics Of

Chemical Kinetics of Hydrogen Atom Abstraction from Allylic Sites by 3O2; Implications for Combustion Modeling and Simulation

2017 ◽  
Vol 121 (9) ◽  
pp. 1890-1899 ◽  
Author(s):  
Chong-Wen Zhou ◽  
John M. Simmie ◽  
Kieran P. Somers ◽  
C. Franklin Goldsmith ◽  
Henry J. Curran
Keyword(s):  
Hydrogen Atom ◽  
Modeling And Simulation ◽  
Chemical Kinetics ◽  
Hydrogen Atom Abstraction ◽  
Combustion Modeling ◽  
Kinetics Of

scholarly journals Density Functional Theory Study into the Reaction Mechanism of Isonitrile Biosynthesis by the Nonheme Iron Enzyme ScoE

2021 ◽  
Author(s):  
Hafiz Saqib Ali ◽  
Sidra Ghafoor ◽  
Sam P. de Visser
Keyword(s):  
Reaction Mechanism ◽  
Hydrogen Atom ◽  
Proton Transfer ◽  
Active Site ◽  
Density Functional ◽  
Active Species ◽  
Nonheme Iron ◽  
Catalytic Cycle ◽  
Hydrogen Atom Abstraction ◽  
Catalytic Cycles

AbstractThe nonheme iron enzyme ScoE catalyzes the biosynthesis of an isonitrile substituent in a peptide chain. To understand details of the reaction mechanism we created a large active site cluster model of 212 atoms that contains substrate, the active oxidant and the first- and second-coordination sphere of the protein and solvent. Several possible reaction mechanisms were tested and it is shown that isonitrile can only be formed through two consecutive catalytic cycles that both use one molecule of dioxygen and α-ketoglutarate. In both cycles the active species is an iron(IV)-oxo species that in the first reaction cycle reacts through two consecutive hydrogen atom abstraction steps: first from the N–H group and thereafter from the C–H group to desaturate the NH-CH2 bond. The alternative ordering of hydrogen atom abstraction steps was also tested but found to be higher in energy. Moreover, the electronic configurations along that pathway implicate an initial hydride transfer followed by proton transfer. We highlight an active site Lys residue that is shown to donate charge in the transition states and influences the relative barrier heights and bifurcation pathways. A second catalytic cycle of the reaction of iron(IV)-oxo with desaturated substrate starts with hydrogen atom abstraction followed by decarboxylation to give isonitrile directly. The catalytic cycle is completed with a proton transfer to iron(II)-hydroxo to generate the iron(II)-water resting state. The work is compared with experimental observation and previous computational studies on this system and put in a larger perspective of nonheme iron chemistry.

Ab initio kinetics studies of hydrogen atom abstraction from methyl propanoate

2016 ◽  
Vol 18 (6) ◽  
pp. 4594-4607 ◽  
Author(s):  
Ting Tan ◽  
Xueliang Yang ◽  
Yiguang Ju ◽  
Emily A. Carter
Keyword(s):  
Hydrogen Atom ◽  
Ab Initio ◽  
Hydrogen Abstraction ◽  
Hydrogen Atom Abstraction ◽  
Kinetics Studies ◽  
Kinetics Of ◽  
Methyl Propanoate

The kinetics of hydrogen abstraction by five radicals (H, CH3, O(3P), OH, and HO2) from a biodiesel surrogate, methyl propanoate (MP), is theoretically investigated.

scholarly journals Highly regioselective hydride transfer, oxidative dehydrogenation, and hydrogen-atom abstraction in the thermal gas-phase chemistry of [Zn(OH)]+/C3H8

2014 ◽  
Vol 16 (48) ◽  
pp. 26617-26623 ◽  
Author(s):  
Xiao-Nan Wu ◽  
Hai-Tao Zhao ◽  
Jilai Li ◽  
Maria Schlangen ◽  
Helmut Schwarz
Keyword(s):  
Hydrogen Atom ◽  
Gas Phase ◽  
Oxidative Dehydrogenation ◽  
Active Site ◽  
Hydride Transfer ◽  
Major Product ◽  
Hydrogen Atom Abstraction ◽  
Gas Phase Chemistry ◽  
System A ◽  
Phase Chemistry

The metal center of [Zn(OH)]+ serves as active site in the regiospecific hydride transfer to generate [i-C3H7]+ as major product in the reaction with C3H8. In the [Zn(OH)]+–C3H8 system, a high regioselectivity features the remarkable chemoselectivity.

Sign in / Sign up

Export Citation Format

Share Document