Selective chemical reactions in supercritical carbon dioxide, water, and ionic liquids

Skouta, Rachid

doi:10.1080/17518250903230001

Cited by 57 publications

(14 citation statements)

References 278 publications

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“…A review by Skouta [108] presents an overview of some selected metal-catalysed chemical reactions developed in supercritical carbon dioxide, water, and ionic liquids. Heck reaction was found to give 55% yield of the coupling products in average when was performed in super critical CO 2 .…”

Section: Catalysis In Multiphase Systems and Supercritical Carbon Diomentioning

confidence: 99%

Heck Reaction—State of the Art

Jagtap¹

2017

Catalysts

167

101

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Abstract:The Heck reaction is one of the most studied coupling reactions and is recognized with the Nobel Prize in Chemistry. Thousands of articles, hundreds of reviews and a number of books have been published on this topic. All reviews are written exhaustively describing the various aspects of Heck reaction and refer to the work done hitherto. Looking at the quantum of the monographs published, and the reviews based on them, we found a necessity to summarize all reviews on Heck reaction about catalysts, ligands, suggested mechanisms, conditions, methodologies and the compounds formed via Heck reaction in one review and generate a resource of information. One can find almost all the catalysts used so far for Heck reaction in this review.

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Section: Catalysis In Multiphase Systems and Supercritical Carbon Diomentioning

confidence: 99%

Heck Reaction—State of the Art

Jagtap¹

2017

Catalysts

167

101

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“…Cellulosic biomass is the most widely distributed renewable resources on the earth (1), it has gained much interest in producing clean biomass energy and green platform chemicals, such as biomass fuel and gas products (2,3). Thermo-chemical liquefaction has been employed as an effective method to convert biomass resources into valuable bio-oil products with various solvents (4)(5)(6). Presently, various supercritical organic solvents (such as cyclohexane, water, methanol and ethanol) were extensively employed as thermo-chemical liquefaction media for biomass liquefaction (7)(8)(9)(10), supercritical liquefaction was proved to be more efficient in liquid products yield and feedstock conversion owing to the excellent advantages of heat and mass transfer (11)(12)(13).…”

Section: Introductionmentioning

confidence: 99%

Investigation of cornstalk cellulose liquefaction in supercritical acetone by FT-TR and GC-MS methods

Xie

Sun

et al. 2019

Green Chemistry Letters and Reviews

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Cornstalk cellulose was liquefied in supercritical acetone at various temperature by a high-pressure autoclave, where the maximum yield of bio-oil was 43.79% and the highest conversion rate of cellulose was 72.13%. FT-TR spectrums showed that the CO -C and CC bonds in cellulose were cleaved under the attack of supercritical acetone, then active fragments were produced and transformed into liquefaction products. GC-MS results showed that the dominant components in bio-oil were ketones, esters, alkanes, etc. As the acetone dosage increased, ketones and glucosides increased while esters and alkanes decreased. A higher temperature was suitable for ketones and esters formation, which had an inhibition on alkanes formation. Finally, the formation of pathways and networks of dominant chemicals during cellulose liquefaction in supercritical acetone were developed. This investigation contributes to the knowledge of cellulose liquefaction in supercritical solvents for bio-oil and platform chemicals, which can provide an alternative method for biomass resources utility.

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“…However, the cleanup of aqueous waste is still difficult and the purification requires extensive energy. 50 Mechanochemistry means mechanical breakage of intramolecular bonds by external force and must be differentiated from molecular solid-state chemistry.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2015

IJPSR

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The objective of present research work is to provide green technique for synthesis of 4-(4-Hydroxyphenyl)-6-methyl-2-oxo-1,2,3,4tetrahydropyrimidine-5-carboxylic acid ethyl ester. Pyrimidine derivatives are well known in the pharmaceutical industry and exhibit to possess a broad spectrum of biological activities. Highly efficient and simple methods complying with principle of Green chemistry have been described in this manuscript for the synthesis with competent yields. As part of current studies, we here in report economical practical techniques like-microwave synthesis, mortal-pastel method (mechanochemistry) and by application of green solvents. On completion of reaction the products were characterized by IR, NMR and Mass Spectra. These methods are more convenient and reactions can be carried out in higher yield (80-96%), shorter reaction time (3-30 min) and milder conditions, without generation of pollution and safer to analyst.

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Selective chemical reactions in supercritical carbon dioxide, water, and ionic liquids

Cited by 57 publications

References 278 publications

Heck Reaction—State of the Art

Heck Reaction—State of the Art

Investigation of cornstalk cellulose liquefaction in supercritical acetone by FT-TR and GC-MS methods

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