An anionic d-valine–palladium(ii) complex supported on a hydroxy double salt with a Brønsted basic phosphate anion: application for a heterogeneous catalyst toward aerobic alcohol oxidation

Hara, Takayoshi; Sawada, Junya; Nakamura, Yoshio; Ichikuni, Nobuyuki; Shimazu, Shogo

doi:10.1039/c1cy00223f

Cited by 23 publications

(14 citation statements)

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“…The Pd/C ECSA decreases to 57.2% aer ADT (Fig. 56 The shapes of the XANES spectra and the edge position of Pd/C and Pd-WC P /G resembled those of Pd foil, suggesting that the oxidation state of Pd in these two samples was almost Pd 0 . 9c), consistent with the observed decrease of formic acid oxidation activity for respective catalysts.…”

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confidence: 90%

Graphene-supported small tungsten carbide nanocrystals promoting a Pd catalyst towards formic acid oxidation

Tao

et al. 2015

RSC Adv.

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Using a microwave assisting method, we successfully synthesized tungsten carbide nanocrystals with a hexagonal prism shape on graphene (WC P /G). The WC P nanocrystals are 5 nm in size and dominated by (01 10), (10 10) and (1 100) facets with a preferred orientation of [0001]. An intermittent microwave heating (IMH) method is also utilized to load Pd nanoparticles (NPs) onto WC P /G to produce Pd-WC P /G, which displays a significant improvement as a catalyst for formic acid oxidation with peak current density increasing by a factor of 7, and notably enhanced durability. We believe this synthesis method of WC P /G opens new possibilities to research shape-controlled and high-surface-area transition metal carbide nanocrystals (TMCs) and developing them as efficient and low-cost catalysts or catalyst supports in a broad range of sustainable energy technologies.

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confidence: 90%

Graphene-supported small tungsten carbide nanocrystals promoting a Pd catalyst towards formic acid oxidation

Tao

et al. 2015

RSC Adv.

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“…The reduction of metal salts by sodium borohydride was observed by UV‐Vis spectroscopy (Figure ). After the addition of reducing agent the characteristic peaks of Pd(II) ion around 323 nm and 428 nm disappeared, which confirms the formation of the nanoparticles …”

Section: Resultsmentioning

confidence: 83%

Bimetallic Pd‐Sn Nanocatalysts for Selective Synthesis of Amines and Imines in Water

Mukhi

Roy

2020

ChemistrySelect

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Aided by our interest in green chemistry, we report the synthesis of a novel Pd‐Sn nano catalyst for C−N coupling reaction in water. The catalyst has been synthesized by a simple wet chemical reduction method and fully characterized by a library of physico‐chemical techniques such as Powder X‐Ray Diffraction (PXRD), High Resolution Transmission Electron Microscopy (HRTEM), X‐Ray Photo Electron Spectroscopy (XPS) and UV‐Vis spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X‐Ray (EDX) spectroscopy, and Inductively Coupled Plasma Optical Emission Spectroscopy (ICP‐OES). The robust Pd‐Sn catalyst shows high catalytic efficiency for the oxidative coupling of benzylamines and tandem coupling between alcohol and amine in water as solvent to give rise to the corresponding secondary amines. However, in presence of oxygen both the reactions stop at the imine stage. As a result, we could guide the reaction to obtain selectively amine or imine. The high efficiency, recyclability and good substrate scope of this Pd‐Sn nanocatalyst is noteworthy. Preliminary mechanistic studies indicated that the reactions proceed via initial activation of N−H bond of amine

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“…To learn more about the nature of the active catalyst, we pursued our mechanistic investigations. In view of the above kinetic studies (Figure ) and the literature data,, , , we reckoned that the noticed induction period could be ascribed to the time required for the conversion of the inactive 1c into the dimeric hydroxy‐platinum catalyst 4 from which the active monomeric specie A would be formed (Scheme ). We then suggested that the reaction of A with an alcohol derivative would lead to the corresponding ketone and the hydrido‐metal species B , either through the formation of an alkoxy‐platinum intermediate followed by a β‐H elimination or a metal promoted direct H‐abstraction .…”

Section: Resultsmentioning

confidence: 84%

Phosphinous Acid Platinum Complex as Robust Catalyst for Oxidation: Comparison with Palladium and Mechanistic Investigations

et al. 2018

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Secondary phosphine oxides proved to be effective preligands to stabilise a hydroxy‐platinum based catalyst that allows the aerobic/anaerobic oxidation of challenging substrates. Kinetic comparisons showed that this system is more efficient and stable than previously reported similar palladium‐based catalysts. A neutral platinum dimer bearing bridging hydroxy ligands has been isolated and fully characterised by X‐ray diffraction and its involvement in the mechanism has been evidenced by mechanistic studies.

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An anionic d-valine–palladium(ii) complex supported on a hydroxy double salt with a Brønsted basic phosphate anion: application for a heterogeneous catalyst toward aerobic alcohol oxidation

Cited by 23 publications

References 50 publications

Graphene-supported small tungsten carbide nanocrystals promoting a Pd catalyst towards formic acid oxidation

Graphene-supported small tungsten carbide nanocrystals promoting a Pd catalyst towards formic acid oxidation

Bimetallic Pd‐Sn Nanocatalysts for Selective Synthesis of Amines and Imines in Water

Phosphinous Acid Platinum Complex as Robust Catalyst for Oxidation: Comparison with Palladium and Mechanistic Investigations

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