Pd/C-catalyzed aerobic oxidative esteriﬁcation of alcohols and aldehydes: a highly efficient microwave-assisted green protocol

Palladium on charcoal( Pd/C)h as lots of salient merits:( i) it is ac heap andc ommercial source of palladium, (ii)i ts hows efficientc atalytic activity even without ligands,( iii)a saheterogeneous catalyst it is easily recycledm any times by simple filtration,a nd (iv) it is applicablet oag reat number of reactions and substrates,a lthough it is eventually less efficient than homogeneous Pd catalysts containing some sophisticated ligands.T hisr eview recalls the main background ands ummarizes the progress made essentially during the last twelve years in Pd/C-catalyzed organic synthesis since the reviews by Felpins group andSekiin2 006.

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“…(35)]. The system proceeded with high yield and selectivity in the absence of ligands and an organic hydrogen acceptor …”

Section: Applications Of Pd/cmentioning

confidence: 99%

Development of the Applications of Palladium on Charcoal in Organic Synthesis

Liu

Astruc

2018

Adv Synth Catal

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“…Best results were obtained with benzyl alcohols and aromatic aldehydes (Scheme 15) [50]. Also in this case, the Pd/C can be regenerated by exposition to H 2 atmosphere under MW dielectric heating (60 • C).…”

Section: Oxygenmentioning

confidence: 93%

Pd/C Catalysis under Microwave Dielectric Heating

2017

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Microwave-assisted organic synthesis (MAOS) provides a novel and efficient means of achieving heat organic reactions. Nevertheless, the potential arcing phenomena via microwave (MW) interaction with solid metal catalysts has limited its use by organic chemists. As arcing phenomena are now better understood, new applications of Pd/C-catalyzed reactions under MW dielectric heating are now possible. In this review, the state of the art, benefits, and challenges of coupling MW heating with heterogeneous Pd/C catalysis are discussed to inform organic chemists about their use with one of the most popular heterogeneous catalysts.

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“…Our experience on MW-assisted esterification comparing dielectric and conductive heating is dating back to the first decade of the century [19]. So far no other technology is fostering this mechanism [20] such as MW with relevant applications in MW-assisted transesterification for biodiesel production where an energy saving of about 50% was calculated [21]. Impressive effect on reaction rate was observed on selective semi-hydrogenations both in batch [22] and in flow [23].…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted protocol for squalene isolation and conversion from oil-deodoriser distillates

Bucciol

Scholz²,

Scholz³

et al. 2019

Green Processing and Synthesis

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Aiming to design a green and efficient protocol for squalane production from low-cost biomasses, a practical and scalable procedure for squalene extraction and hydrogenation to squalane is presented herein. The oil-deodoriser distillates that are produced by the vegetal-oil production chain are a renewable and cheap source of squalene. We were able to isolate an enriched fraction containing 89.0% of pure squalene (yield 55.4%) from a matrix containing about 2% squalene. Efficient microwave- assisted esterification under heterogeneous catalysis enabled the separation of fatty-acid methyl esters (FAME) via vacuum distillation. The residue was purified by flash-chromatography on a C-18 silica column using MeOH/H2O/2-propanol as the mobile phase. Finally, squalene was hydrogenated to the more stable squalane in a pressure-resistant microwave reactor. The reaction was performed over a Pd/C catalyst in EtOH, and even in solvent-free conditions, and was optimised using commercial squalene (5 bar of H2 at 100°C for 1 h).

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Pd/C-catalyzed aerobic oxidative esteriﬁcation of alcohols and aldehydes: a highly efficient microwave-assisted green protocol

Cited by 26 publications

References 60 publications

Development of the Applications of Palladium on Charcoal in Organic Synthesis

Development of the Applications of Palladium on Charcoal in Organic Synthesis

Pd/C Catalysis under Microwave Dielectric Heating

Microwave-assisted protocol for squalene isolation and conversion from oil-deodoriser distillates

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