Introducing deep eutectic solvents as biorenewable media for Au(i)-catalysed cycloisomerisation of γ-alkynoic acids: an unprecedented catalytic system

2014 ◽  
Vol 50 (85) ◽  
pp. 12927-12929 ◽  
Author(s):  
María J. Rodríguez-Álvarez ◽  
Cristian Vidal ◽  
Josefina Díez ◽  
Joaquín García-Álvarez
Keyword(s):  
Catalytic System ◽  
Room Temperature ◽  
Eutectic Mixture ◽  
Deep Eutectic Solvents ◽  
Co Catalysts ◽  
System P

Cycloisomerisation reactions of γ-alkynoic acids can be conveniently performed in the eutectic mixture 1ChCl/2Urea at room temperature, under air and in the absence of co-catalysts by using a novel iminophosphorane–Au(i) complex.

scholarly journals Extraction of High Value Triterpenic Acids from Eucalyptus globulus Biomass Using Hydrophobic Deep Eutectic Solvents

Molecules ◽  
2020 ◽  
Vol 25 (1) ◽  
pp. 210 ◽  
Author(s):  
Nuno H. C. S. Silva ◽  
Eduarda S. Morais ◽  
Carmen S. R. Freire ◽  
Mara G. Freire ◽  
Armando J. D. Silvestre
Keyword(s):  
Ursolic Acid ◽  
Eucalyptus Globulus ◽  
Room Temperature ◽  
Eutectic Mixture ◽  
Value Added ◽  
Deep Eutectic Solvents ◽  
Biological Properties ◽  
Outer Bark ◽  
Triterpenic Acids ◽  
By Products

Triterpenic acids (TTAs), known for their promising biological properties, can be found in different biomass sources and related by-products, such as Eucalyptus globulus bark, and have been extracted using organic volatile solvents such as dichloromethane. Recently, deep eutectic solvents (DES) have been identified as promising alternatives for the extraction of value-added compounds from biomass. In the present work, several hydrophobic DES were tested for the extraction of TTAs from E. globulus bark. Initial solubility studies revealed that DES based on menthol and thymol as the most promising solvents for these compounds given the highest solubilities obtained for ursolic acid (UA) at temperatures ranging from room temperature up to 90 °C. Accordingly, an eutectic mixture of menthol:thymol (1:2) was confirmed as the best candidate for the TTAs extraction from E. globulus outer bark, leading to extraction yields (weight of TTA per weight of biomass) at room temperature of 1.8 wt% for ursolic acid, 0.84 wt% for oleanolic acid and 0.30 wt% for betulinic acid. These values are significantly higher than those obtained with conventional organic solvents under similar conditions. The results obtained using these DES are promising for the recovery of TTAs for nutraceutical and pharmacological applications, while reinforcing the potential of DES as promising solvents to be applied in biorefinery processes.

Room-temperature selective oxidation of 2-naphthol to BINOL using a Au/SrTiO3–H2O2 catalytic system

2015 ◽  
Vol 51 (100) ◽  
pp. 17669-17671 ◽  
Author(s):  
Shin-ichi Naya ◽  
Yuta Hiramoto ◽  
Miwako Teranishi ◽  
Hiroaki Tada
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Gold Nanoparticle ◽  
Selective Oxidation ◽  
Catalytic System ◽  
Room Temperature ◽  
Bond Formation ◽  
System P ◽  
Au Particle Size

Gold nanoparticle-loaded SrTiO3 (Au/SrTiO3) effectively catalyzes the selective C–C bond formation between 2-naphthol molecules to yield BINOL in the presence of H2O2, and the catalytic activity increases with decreasing Au particle size (d) in the range 2.6 ≤ d ≤ 8.9 nm.

Synthesis of medicinally important quinazolines decorated with 1,4-disubstituted-1,2,3-triazoles using CuSO4·5H2O–Et3N catalytic system

RSC Advances ◽  
2014 ◽  
Vol 4 (45) ◽  
pp. 23679-23684 ◽  
Author(s):  
Monika Vashist ◽  
Khushbu Kushwaha ◽  
Reena Kaushik ◽  
Subhash C. Jain
Keyword(s):  
Catalytic System ◽  
Room Temperature ◽  
Dipolar Cycloaddition ◽  
Terminal Alkyne ◽  
Sulfate Pentahydrate ◽  
System P ◽  
Direct Use

The direct use of Cu(ii) sulfate pentahydrate in the presence of triethylamine afforded 1,4-disubstituted-1,2,3-triazoles via 1,3-dipolar cycloaddition of terminal alkyne(s) to azide(s) at room temperature.

A review of sustainable lignocellulose biorefining applying (natural) deep eutectic solvents (DESs) for separations, catalysis and enzymatic biotransformation processes

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ana Bjelić ◽  
Brigita Hočevar ◽  
Miha Grilc ◽  
Uroš Novak ◽  
Blaž Likozar
Keyword(s):  
Special Section ◽  
Cost Effective ◽  
Deep Eutectic Solvents ◽  
Reaction Conditions ◽  
Co Catalysts ◽  
Biomass Fractionation ◽  
Functional Step ◽  
Natural Deep Eutectic Solvents ◽  
Economic Need ◽  
Molecular Compounds

AbstractConventional biorefinery processes are complex, engineered and energy-intensive, where biomass fractionation, a key functional step for the production of biomass-derived chemical substances, demands industrial organic solvents and harsh, environmentally harmful reaction conditions. There is a timely, clear and unmet economic need for a systematic, robust and affordable conversion method technology to become greener, sustainable and cost-effective. In this perspective, deep eutectic solvents (DESs) have been envisaged as the most advanced novel polar liquids that are entirely made of natural, molecular compounds that are capable of an association via hydrogen bonding interactions. DES has quickly emerged in various application functions thanks to a formulations’ simple preparation. These molecules themselves are biobased, renewable, biodegradable and eco-friendly. The present experimental review is providing the state of the art topical overview of trends regarding the employment of DESs in investigated biorefinery-related techniques. This review covers DESs for lignocellulosic component isolation, applications as (co)catalysts and their functionality range in biocatalysis. Furthermore, a special section of the DESs recyclability is included. For DESs to unlock numerous new (reactive) possibilities in future biorefineries, the critical estimation of its complexity in the reaction, separation, or fractionation medium should be addressed more in future studies.

Thermal Conductivity of Room Temperature Deep Eutectic Solvents

2021 ◽  
Author(s):  
Noor Albayati ◽  
Mohammed Kadhom ◽  
Ghassan Abdullah ◽  
Suhaib Salih
Keyword(s):  
Thermal Conductivity ◽  
Room Temperature ◽  
Deep Eutectic Solvents

Pure room temperature phosphorescence emission of organic host-guest doped system with quantum efficiency of 64%

2021 ◽  
Author(s):  
Xiaoqing Liu ◽  
Wenbo Dai ◽  
Qian Junjie ◽  
Yunxiang Lei ◽  
Miaochang Liu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Halogen Atoms ◽  
System P ◽  
Phosphorescence Emission

A new doped system with pure phosphorescent emission is constructed using four 1-(4-(diphenylamino)phenyl)-2-phenylethan-1-one derivatives containing halogen atoms as the guests and benzophenone as the host. That is, the doped system...

Atom-transfer radical addition of fluoroalkyl bromides to alkenes via a photoredox/copper catalytic system

2021 ◽  
Author(s):  
Vladislav S. Kostromitin ◽  
Artem A. Zemtsov ◽  
Vladimir A. Kokorekin ◽  
Vitalij V. Levin ◽  
Alexander D. Dilman
Keyword(s):  
Catalytic System ◽  
Radical Addition ◽  
Atom Transfer ◽  
Alkyl Bromides ◽  
System P ◽  
Atom Transfer Radical Addition

A method for the addition of fluorinated alkyl bromides to alkenes is described.

Synthesis of 2-aminothiazoles from methylcarbonyl compounds using a Fe3O4 nanoparticle-N-halo reagent catalytic system

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 64749-64755 ◽  
Author(s):  
Masoud Sadeghi ◽  
Javad Safari ◽  
Zohre Zarnegar
Keyword(s):  
Catalytic System ◽  
Fe3o4 Nanoparticle ◽  
Catalytic Systems ◽  
System P

An efficient protocol is developed for the synthesis of 2-aminothiazoles from unfunctionalized methylcarbonyl compounds using Fe3O4 nanoparticle-N-halo reagent catalytic systems.

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