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A Molybdenum(VI) Complex of 5-(2-pyridyl-1-oxide)tetrazole: Synthesis, Structure, and Transformation into a MoO3-Based Hybrid Catalyst for the Epoxidation of Bio-Olefins. Catalysts 2023. [DOI: 10.3390/catal13030565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023] Open
Abstract
The discovery of heterogeneous catalysts synthesized in easy, sustainable ways for the valorization of olefins derived from renewable biomass is attractive from environmental, sustainability, and economic viewpoints. Here, an organic–inorganic hybrid catalyst formulated as [MoO3(Hpto)]·H2O (2), where Hpto = 5-(2-pyridyl-1-oxide)tetrazole, was prepared by a hydrolysis–condensation reaction of the complex [MoO2Cl2(Hpto)]∙THF (1). The characterization of 1 and 2 by FT-IR and Raman spectroscopies, as well as 13C solid-state NMR, suggests that the bidentate N,O-coordination of Hpto in 1 (forming a six-membered chelate ring, confirmed by X-ray crystallography) is maintained in 2, with the ligand coordinated to a molybdenum oxide substructure. Catalytic studies suggested that 2 is a rare case of a molybdenum oxide/organic hybrid that acts as a stable solid catalyst for olefin epoxidation with tert-butyl hydroperoxide. The catalyst was effective for converting biobased olefins, namely fatty acid methyl esters (methyl oleate, methyl linoleate, methyl linolenate, and methyl ricinoleate) and the terpene limonene, leading predominantly to the corresponding epoxide products with yields in the range of 85–100% after 24 h at 70 °C. The versatility of catalyst 2 was shown by its effectiveness for the oxidation of sulfides into sulfoxides and sulfones, at 35 °C (quantitative yield of sulfoxide plus sulfone, at 24 h; sulfone yields in the range of 77–86%). To the best of our knowledge, 2 is the first molybdenum catalyst reported for methyl linolenate epoxidation, and the first of the family [MoO3(L)x] studied for methyl ricinoleate epoxidation.
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Bruno SM, Valente AA, Gonçalves IS, Pillinger M. Group 6 carbonyl complexes of N,O,P-ligands as precursors of high-valent metal-oxo catalysts for olefin epoxidation. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Gomes DM, Silva AF, Gomes AC, Neves P, Valente AA, Gonçalves IS, Pillinger M. Pyrazine-bridged molybdenum(0) carbonyl and molybdenum(VI) oxide network solids as catalysts for epoxidation and sulfoxidation. Catal Today 2023. [DOI: 10.1016/j.cattod.2023.114050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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Lysenko AB, Senchyk GA, Domasevitch KV, Neves P, Valente AA, Pillinger M, Gonçalves IS. Hydrophobic/Hydrophilic Interplay in 1,2,4‐Triazole‐ or Carboxylate‐Based Molybdenum(VI) Oxide Hybrids: A Step Toward Development of Reaction‐Induced Self‐Separating Catalysts. ChemCatChem 2021. [DOI: 10.1002/cctc.202100389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Andrey B. Lysenko
- Inorganic Chemistry Department Taras Shevchenko National University of Kyiv Kyiv 01033 Ukraine
| | - Ganna A. Senchyk
- Inorganic Chemistry Department Taras Shevchenko National University of Kyiv Kyiv 01033 Ukraine
| | | | - Patrícia Neves
- Department of Chemistry CICECO – Aveiro Institute of Materials University of Aveiro Campus Universitário de Santiago 3810-193 Aveiro Portugal
| | - Anabela A. Valente
- Department of Chemistry CICECO – Aveiro Institute of Materials University of Aveiro Campus Universitário de Santiago 3810-193 Aveiro Portugal
| | - Martyn Pillinger
- Department of Chemistry CICECO – Aveiro Institute of Materials University of Aveiro Campus Universitário de Santiago 3810-193 Aveiro Portugal
| | - Isabel S. Gonçalves
- Department of Chemistry CICECO – Aveiro Institute of Materials University of Aveiro Campus Universitário de Santiago 3810-193 Aveiro Portugal
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