Ultrasound and photo-assisted oxidation of toluene and benzyl alcohol with oxidovanadium(V) complexes

Sutradhar, Manas; Martins, Marta; Simões, David; Serôdio, Rita M.N.; Lapa, Hugo M.; Alegria, Elisabete C. B. A.; Silva, M. Fátima C. Guedes da; Pombeiro, Armando J. L.

doi:10.1016/j.apcata.2022.118623

Cited by 13 publications

(11 citation statements)

References 51 publications

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“…Performing the reaction in the presence of a carbon- and oxygen-based radical trap, namely, diphenylamine, had a significant inhibition effect (Table , entry 21), which indicates the radical nature of the reaction. Therefore, the course of the reaction is expected to follow the mechanism presented in eqs –. [ Mn III ] + BuOOH t → BuOO t • + H + + [ Mn II ] [ Mn II ] + BuOOH t → B t uO • + HO − + [ Mn III ] B t uO • + PhCH 3 → BuOH t + PhCH 2 • PhCH 2 • + O 2 → PhCH 2 OO • 2 PhCH 2 OO • → PhCHO + PhCH 2 OH + O 2 …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Performing the reaction in the presence of a carbon-and oxygen-based radical trap, namely, diphenylamine, 72 (4)…”

Section: ■ Introductionmentioning

confidence: 99%

“…Significant progress has been made in the field of homogeneous catalytic oxidation of toluene using various abundant first-row transition metal catalysts that show promising catalytic activities. − Manganese-based catalysts have gained considerable attention due to the high natural abundance and varied oxidation states (−3 to +7) of this metal. ,− Although hydrocarbon catalytic oxidation reactions based on Mn complexes have been intensively studied, − their utilization for homogeneous oxidation of toluene is still very scarce …”

Section: Introductionmentioning

confidence: 99%

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Cagelike Manganesesilsesquioxane Complexes: Synthesis via an Acetone Approach, Structure, and Catalytic Activity for Toluene Oxidation

Bilyachenko,

Gutsul,

Khrustalev

et al. 2023

Crystal Growth & Design

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The study describes a new feature in the self-assembly of cagelike manganese-based phenylsilsesquioxanes consisting of the strong influence of acetone solvates on the formation of a cage structure. By this convenient approach, a series of new tri and tetra manganese-based silsesquioxane complexes with (i) 1,10-phenanthroline, (ii) pyrazine, or (iii) 3,5-dimethylpyrazole (dmpzH) ligands were isolated and characterized. Single-crystal X-ray diffraction studies established the molecular architectures of all of the synthesized products. Several compounds represent extraordinary types of cagelike metallasilsesquioxane (CLMS) molecular architectures. Pyrazine- and dmpzH-based Mn3Na3 compounds exhibit total oxidation of initial Mn(II) ions to the Mn(III) state. They present relatively weak antiferromagnetic interactions between the manganese centers. The catalytic performance of a representative precatalyst Mn–CLMS compound, [(Ph6Si6O12)2Mn3Na3(dmpzH)3(acetone)3(H2O)], was investigated for the microwave-assisted oxidation of toluene to obtain benzaldehyde, benzyl alcohol, and benzoic acid as the main products. The effects of reaction parameters were studied, and under optimized conditions, using the t BuOOH oxidant, the oxygenated products were formed with a total yield of 54%, under microwave irradiation at 100 °C after 6 h, with 70% selectivity toward the formation of benzoic acid.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Performing the reaction in the presence of a carbon-and oxygen-based radical trap, namely, diphenylamine, 72 (4)…”

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cagelike Manganesesilsesquioxane Complexes: Synthesis via an Acetone Approach, Structure, and Catalytic Activity for Toluene Oxidation

Bilyachenko,

Gutsul,

Khrustalev

et al. 2023

Crystal Growth & Design

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“…There is a large variety of industrial waste enrich of organic compounds that are considered toxic and harmful and constitute major sources of pollution. In recent decades, most of the research works have been carried out for the treatment of the contaminated organic wastewater, which involves several methods such as bio treatment, chemical treatment, and advanced photo oxidation process (AOP) (Al-Dawery, 2013; Sutradhar et al, 2022;Yang et al, 2019). Photooxidation is series of chemical reactions in which number of reactive oxide radicals (O 2…”

Section: Introductionmentioning

confidence: 99%

Effect of metals doped TiO2 composite on degradation of methylene blue

Farooq

Dawery

Annamareddy

et al. 2023

Preprint

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Many types of organic compounds are being discharged in ever-increasing quantities into the environment. In the present work, catalysts composed of titanium dioxide and metals with the presence of ultraviolet light or visible light are used for the degradation of organic contaminants. Single and dual metals (Fe+ 3 and Co+ 2) doped TiO2 were prepared using sol-gel method and wet impregnation methods for the degradation of the methylene blue. The composition and morphology of the prepared catalysts were analyzed using EDX and SEM techniques. The results demonstrated that iron and cobalt are dispersed on the surface and between the interfaces of the TiO2. The diameter of pure TiO2 nanoparticles was 54 nm, while that of Fe-and Co doped TiO2 nanoparticles were 45.6 and 38 nm respectively. The results showed that the degradation of methylene blue using different prepared catalysts were: 80% using pure 500ppm TiO2 with UV irradiation; 60% and 70% using sol-gel 1 g Fe doped 1 g TiO2 with UV and visible lights respectively; 90% and 50% using sol-gel 1 g Fe doped 2 g TiO2 with UV and visible lights respectively. For the case of prepared catalyst by wet impregnation metal- TiO2, the degradation of methyl blue were; 50% and 35% using Fe- TiO2 with UV and visible lights respectively; 50% using Co-TiO2 with both UV and normal lights. However, combing Fe-Co-TiO2 gave 30% degradation with both UV and visible lights. These results indicates that the addition of metals to the TiO2 can improve the degradation of organic materials using visible light irradiation which is impossible with pure TiO2.

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