Hydrodechlorination of chlorinated benzenes in a continuous microwave reactor

Pillai, Unnikrishnan R.; Sahle‐Demessie, Endalkachew; Varma, Rajender S.

doi:10.1039/b403366c

Cited by 69 publications

(71 citation statements)

References 29 publications

(21 reference statements)

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“…Although a few papers report that palladium oxide can act as the active phase for alcohol oxidation, [9,10] most of recent studies have shown that the supported Pd nanoparticles are excellent catalysts for the selective oxidation of alcohols by oxygen or air. [11][12][13][14][15] For example, Pd/ MgO containing Pd particles with a mean size of 6.9 nm was reported to be efficient for the aerobic oxidation of various alcohols in trifluorotoluene solvent. [11] Pd nanoparticles with a mean diameter of ca.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14][15] For example, Pd/ MgO containing Pd particles with a mean size of 6.9 nm was reported to be efficient for the aerobic oxidation of various alcohols in trifluorotoluene solvent. [11] Pd nanoparticles with a mean diameter of ca. 9 nm supported on an amphiphilic resin catalyzed the aerobic oxidation of benzylic and allylic alcohols in water medium.…”

Section: Introductionmentioning

confidence: 99%

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Size‐Dependent Catalytic Activity of Supported Palladium Nanoparticles for Aerobic Oxidation of Alcohols

et al. 2008

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Silica-alumina (SiO 2 -Al 2 O 3 )-supported palladium catalysts prepared by adsorption of the tetrachloropalladate anion (PdCl 4 2À ) followed by calcination and reduction with either hexanol or hydrogen were studied for the aerobic oxidation of alcohols. The mean size of the Pd particles over the SiO 2 -Al 2 O 3 support was found to depend on the Si/Al ratio, and a decrease in the Si/Al ratio resulted in a decrease in the mean size of the Pd nanoparticles. By changing the Si/Al ratio, we obtained supported Pd nanoparticles with mean sizes ranging from 2.2 to 10 nm. The interaction between the Pd precursor and the support was proposed to play a key role in tuning the mean size of the Pd nanoparticles. The Pd/SiO 2 -Al 2 O 3 catalyst with an appropriate mean size of Pd particles could catalyze the aerobic oxidation of various alcohols to the corresponding carbonyl compounds, and this catalyst was particularly efficient for the solvent-free conversion of benzyl alcohol. The intrinsic turnover frequency per surface Pd atom depended significantly on the mean size of Pd particles and showed a maximum at a medium mean size (3.6-4.3 nm), revealing that the aerobic oxidation of benzyl alcohol catalyzed by the supported Pd nanoparticles was structure-sensitive.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Size‐Dependent Catalytic Activity of Supported Palladium Nanoparticles for Aerobic Oxidation of Alcohols

et al. 2008

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“…These supported catalysts (palladium content of 0.5 wt%) were prepared by impregnating Pd onto the surface of supports and subsequent calcination treatment. [14] Among these tested catalysts, Pd/MgO catalyst exhibited the best performance. As expected, protodecarboxylation of carboxylic acids occurred as a side reaction when the less active catalyst was used.…”

Section: Resultsmentioning

confidence: 99%

“…[14] When Palladium species were impregnated onto the MgO, X-ray photoelectron spectroscopy (XPS) of the Pd 3d core level showed a Pd 5/2 line at a binding energy of 336.1 eV, which clearly indicated that the palladium species are in the ＋2 oxidation state (see Supporting Information). [15] XRD patterns of the catalyst sample showed characteristic peaks corresponding to MgO, indicating a good maintenance of the crystallinity of MgO (see Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Pd/MgO：A Recyclable, Ligand-free Heterogeneous Catalyst for Decarboxylative Cross-Coupling of Arene Carboxylic Acids with Aryl Halides

李召好¹,

陈静²,

苏伟平³

et al. 2014

Acta Chim. Sinica

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Decarboxylative coupling of arene carboxylic acids with aryl halides is achieved by using a ligand-free Pd/MgO (0.5 mol% Pd) heterogeneous catalyst system. Both electron-rich and electron-deficient arene carboxylic acids can be used as aryl sources to couple a variety of aryl bromides, even aryl chlorides in moderate-to-excellent yields. The establishment of heterogeneous catalysis for the decarboxylative cross-coupling along with the reusability of the heterogeneous catalyst should facilitate the practical application of this transformation in organic synthesis.

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“…Nowadays, there are many types of continuous flow MW reactors, which include a normal flask or tube [21], a fixed bed turbular coil [22][23][24], an Ω-or U-shaped tube [25][26][27][28], a filled column [22,24,29] (Fig. 1.7), a spiral glass tube [21,[30][31][32] (e.g.…”

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confidence: 99%