A Common Active Intermediate in the Oxidation of Alkenes, Alcohols and Alkanes with H2O2 and a Mn(II)/Pyridin-2-Carboxylato Catalyst

Johann B. Kasper, Pattama Saisaha, Maurits de Roo, Mitchell J. Groen, Laia Vicens, Margarida Borrell, Johannes W. de Boer, Ronald Hage, Miquel Costas, Wesley R. Browne*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
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Abstract

The mechanism and the reactive species involved in the oxidation of alkenes, and alcohols with H2O2, catalysed by an in situ prepared mixture of a MnII salt, pyridine-2-carboxylic acid and a ketone is elucidated using substrate competition experiments, kinetic isotope effect (KIE) measurements, and atom tracking with 18O labelling. The data indicate that a single reactive species engages in the oxidation of both alkenes and alcohols. The primary KIE in the oxidation of benzyl alcohols is ca. 3.5 and shows the reactive species to be selective despite a zero order dependence on substrate concentration, and the high turnover frequencies (up to 30 s−1) observed. Selective 18O labelling identifies the origin of the oxygen atoms transferred to the substrate during oxidation, and is consistent with a highly reactive, e. g., [MnV(O)(OH)] or [MnV(O)2], species rather than an alkylperoxy or hydroperoxy species.

Original languageEnglish
Article numbere202201072
Number of pages8
JournalChemCatChem
Volume15
Issue number1
DOIs
Publication statusPublished - 9-Jan-2023

Keywords

  • alkene
  • isotope labelling
  • kinetic isotope effect
  • manganese
  • oxidation chemistry

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