Fe4(SiW12O40)3-catalyzed glycerol acetylation: Synthesis of bioadditives by using highly active Lewis acid catalyst

Silva, Márcio José Da; Liberto, Natália A.; Leles, Lorena C. de Andrade; Pereira, Ulisses Alves

doi:10.1016/j.molcata.2016.03.003

Cited by 51 publications

(32 citation statements)

References 43 publications

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“…Keggin heteropolyacids (HPAs) are attractive catalysts and are highly active in oxidative and acid‐catalyzed reactions . Their unique chemical‐physical properties can be easily manipulated with a suitable tailoring of their constitution, removing their protons that are undesirable in oxidation reactions and introducing metal cations that may contribute to achieve the catalytic properties adequate to the process …”

Section: Introductionmentioning

confidence: 82%

A Rare Carbon Skeletal Oxidative Rearrangement of Camphene Catalyzed by Al‐Exchanged Keggin Heteropolyacid Salts

et al. 2019

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In this work, aluminum-exchanged Keggin heteropolyacid salts (i. e., AlPW 12 O 40 , AlPMo 12 O 40 , and Al 4/3 SiW 12 O 40 ) were synthesized and evaluated as catalysts on the camphene oxidation with hydrogen peroxide. The aluminum silicotungstate salt (i. e., Al 4/ 3 SiW 12 O 40 ) was the most active and selective toward formation of borneol and two novel products; 1-(3-(2-hydroxypropan-2-yl) cyclopentyl) ethan-1-one, and 3-(3-hydroxycyclopentyl)-3methylbutan-2-one), which were spectroscopically character-ized (FT-IR, 13 C and 1 H NMR analyses). All the catalysts were characterized by FT-IR/ ATR spectroscopy, BET, XRD, EDS/SEM, and TG/DSC analyses. After the characterization of the HPA salts, it was possible to link their structural properties to their catalytic activity. The effects of the main reaction variables were assessed. The aluminum cation as well as the silicotungstic anion showed to be essential to formation of three goalproducts.

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Section: Introductionmentioning

confidence: 82%

A Rare Carbon Skeletal Oxidative Rearrangement of Camphene Catalyzed by Al‐Exchanged Keggin Heteropolyacid Salts

et al. 2019

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“…This small consumption of base can explain why the FT‐IR spectra of potassium HPA salts showed an absorption band at 1600 cm −1 , which is attributed to the (H 5 O 2 + ) di‐hydronium cation ,. It means that even after replacing the protons by metal cations, a minimum portion of acidity persists.…”

Section: Resultsmentioning

confidence: 92%

“…have assigned this shifting to the presence of transition metal cations in the octahedral lacuna . The presence of residual nitrate anions was confirmed by characteristic absorption bands of this anion around 1350 cm −1 …”

Section: Resultsmentioning

confidence: 99%

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

et al. 2019

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In this work, we synthesized a series of metal-substituted potassium heteropolyacid salts and investigated its catalytic activity on oxidation of benzyl alcohol with H 2 O 2 under homogeneous (CH 3 CN) and biphasic (toluene/water) conditions. The Keggin heteropolyacids were converted to lacunar salts (i. e., K 7 PW 11 O 39 ; K 7 PMo 11 O 39 and K 8 SiW 11 O 39 ), which had their vacancies filled with metal cations (i. e., Al 3 + , Fe 3 + , Co 2 + , Cu 2 + , and Ni 2 + ), generating the metal-substituted salts. The K 5 PW 11 NiO 39 proved to be the most efficient catalyst. The synergic effect raised between the PW 11 O 39 7À anion and Ni 2 + cation improved the redox properties and the activity of the catalyst. The K 5 PW 11 NiO 39 catalyst was able to promote the benzyl alcohol oxidation with hydrogen peroxide in biphasic conditions in the absence of phase transfer catalyst. Benzaldehyde and benzoic acid were the main products. The effects of main reaction parameters were assessed. The K 5 PW 11 NiO 39 catalyst was successfully recovered and reused without losing activity.

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“…The initial electrode potential (E i ) allows to distinguish the acidity strength of protons as follow; E i > 100 mV (very strong sites), 0 < E i < 100 mV (strong sites), À100 < E i < 0 (weak sites) and E i < À100 mV (very weak sites). 28 So, the values of (E i ) in Fig. 4 demonstrate that all the catalysts have very strong acidity.…”

Section: Assessing the Acidity Strength Of Catalystsmentioning

confidence: 82%

An unexpected behavior of H₃PMo₁₂O₄₀heteropolyacid catalyst on the biphasic hydrolysis of vegetable oils

Silva

Teixeira

2017

RSC Adv.

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Fe4(SiW12O40)3-catalyzed glycerol acetylation: Synthesis of bioadditives by using highly active Lewis acid catalyst

Cited by 51 publications

References 43 publications

A Rare Carbon Skeletal Oxidative Rearrangement of Camphene Catalyzed by Al‐Exchanged Keggin Heteropolyacid Salts

A Rare Carbon Skeletal Oxidative Rearrangement of Camphene Catalyzed by Al‐Exchanged Keggin Heteropolyacid Salts

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

An unexpected behavior of H₃PMo₁₂O₄₀heteropolyacid catalyst on the biphasic hydrolysis of vegetable oils

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Fe4(SiW12O40)3-catalyzed glycerol acetylation: Synthesis of bioadditives by using highly active Lewis acid catalyst

Cited by 51 publications

References 43 publications

A Rare Carbon Skeletal Oxidative Rearrangement of Camphene Catalyzed by Al‐Exchanged Keggin Heteropolyacid Salts

A Rare Carbon Skeletal Oxidative Rearrangement of Camphene Catalyzed by Al‐Exchanged Keggin Heteropolyacid Salts

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

An unexpected behavior of H3PMo12O40heteropolyacid catalyst on the biphasic hydrolysis of vegetable oils

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An unexpected behavior of H₃PMo₁₂O₄₀heteropolyacid catalyst on the biphasic hydrolysis of vegetable oils