Volume 128, Issue 37 pp. 11257-11261
Zuschrift

Deformylation Reaction by a Nonheme Manganese(III)–Peroxo Complex via Initial Hydrogen-Atom Abstraction

Prasenjit Barman

Prasenjit Barman

Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781039 India

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Pranav Upadhyay

Pranav Upadhyay

Department of Applied Physics, School of Physical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, 226025 India

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Abayomi S. Faponle

Abayomi S. Faponle

Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester, M1 7DN UK

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Jitendra Kumar

Jitendra Kumar

Department of Applied Physics, School of Physical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, 226025 India

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Sayanta Sekhar Nag

Sayanta Sekhar Nag

Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781039 India

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Dr. Devesh Kumar

Corresponding Author

Dr. Devesh Kumar

Department of Applied Physics, School of Physical Sciences, Babasaheb Bhimrao Ambedkar University, Lucknow, 226025 India

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Dr. Chivukula V. Sastri

Corresponding Author

Dr. Chivukula V. Sastri

Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781039 India

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Dr. Sam P. de Visser

Corresponding Author

Dr. Sam P. de Visser

Manchester Institute of Biotechnology and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester, M1 7DN UK

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First published: 08 July 2016
Citations: 25

Abstract

Metal–peroxo intermediates are key species in the catalytic cycles of nonheme metalloenzymes, but their chemical properties and reactivity patterns are still poorly understood. The synthesis and characterization of a manganese(III)–peroxo complex with a pentadentate bispidine ligand system and its reactivity with aldehydes was studied. Manganese(III)–peroxo can react through hydrogen-atom abstraction reactions instead of the commonly proposed nucleophilic addition reaction. Evidence of the mechanism comes from experiments which identify a primary kinetic isotope effect of 5.4 for the deformylation reaction. Computational modeling supports the established mechanism and identifies the origin of the reactivity preference of hydrogen-atom abstraction over nucleophilic addition.

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