Chemistry and catalytic performance of pyridyl-benzimidazole oxidomolybdenum(VI) compounds in (bio)olefin epoxidation
| Autor: | Martyn Pillinger, Anabela A. Valente, André D. Lopes, Isabel S. Gonçalves, Lucie S. Nogueira, Ana C. Gomes, Patrícia Neves, Tânia S. M. Oliveira |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Metal-organic framework
Epoxide Dioxo complexes Homogeneous catalysis 010402 general chemistry 01 natural sciences Dioxomolybdenum(Vi)-bpyridine complexes 12. Responsible consumption Catalysis Inorganic Chemistry chemistry.chemical_compound Oxo-molybdenum complexes Polymer chemistry Organic chemistry Hydrothermal synthesis Hydrogen peroxide Peroxo complexes Olefin fiber Structural elucidation Rhenium complexes 010405 organic chemistry 0104 chemical sciences Solvent Efficient catalysts chemistry Ionic liquid Hybrid material |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | The chemistry and catalytic performance of the dichlorido complex [MoO2Cl2(pbim)] (1) [pbim = 2-(2-pyridyl)benzimidazole] in the epoxidation of olefins is reported. Complex 1 acts as a precatalyst and is more effective with tert-butyl-hydroperoxide (TBHP) as the oxidant than with aq. hydrogen peroxide: the cis-cyclooctene (Cy) reaction with TBHP gave 98 % epoxide yield at 70 degrees C/24 h. Catalyst characterization showed that 1 is transformed in situ to the oxidodiperoxido complex [MoO(O-2)(2)(pbim)] (2), with H2O2 and a hybrid molybdenum(VI) oxide solid formulated as [MoO3(pbim)] (3) with TBHP. The hybrid material 3 was prepared on a larger scale and explored for the epoxidation of the biorenewable olefins methyl oleate, methyl linoleate, and (R)-(+)-limonene. With TBHP as the oxidant, 3 acts as a source of soluble active species of the type 2. A practical method for recycling oxidodiperoxidomolybdenum(VI) catalysts for the Cy/TBHP reaction is demonstrated by using an ionic liquid as the solvent for the molecular catalyst 2. National funds through the Fundacao para a Ciencia e a Tecnologia (FCT) [POCI-01-0145-FEDER-007679, PD/BD/109666/2015] Ministerio da Educacao e Ciencia (MEC) Fundo Europeu de Desenvolvimento Regional (FEDER) European Union [PD/BD/109666/2015, SFRH/BPD/110530/2015, SFRH/BPD/108541/2015] Ministerio da Ciencia, Tecnologia e Ensino Superior (MCTES) European Social Fund through the program Programa Operacional Potencial Humano (POPH) of Quadro de Referencia Estrategica Nacional (QREN) info:eu-repo/semantics/publishedVersion |
| Databáze: | OpenAIRE |
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