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Green Chemistry
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We report a magnetically separable Cu nanocatalyst (Fe-DOPA-Cu) for the borylation of alkyl halides with alkoxy diboron reagents, providing alkylboronic esters in high yields, with broad functional-group tolerance under mild reaction conditions. The procedure is also applicable to the borylation of benzyl chlorides and bromides. Radical-clock experiments support a radical-mediated process. Easy recycling of the catalyst resulted in no significant loss of activity up to ten runs.
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We use ultra-Small Angle X-ray Scattering (USAXS) to investigate the evolution of size, morphology, volume fraction and number concentration of humins formed during dehydration of fructose to 5-hydroxymethylfurfural (HMF), and the further polymerization of HMF between 80-95 °C in 1 M hydrochloric acidic solutions. The radius of gyration (Rg) of suspended humins particles grows linearly with time and is accompanied by an increase in polydispersity (PD), before possible precipitation occurs. The s...
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#1Jikuan QiuH-Index: 4
#2Huiyong WangH-Index: 19
Last. Jianji WangH-Index: 42
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Although significant progress has been made in the synthesis of covalent organic frameworks (COFs) in recent years, the construction of hierarchical pore in such materials remains a great challenge. Herein, we report a facile synthesis of hierarchically porous COFs (HP-COFs) under mild conditions in ionic liquids 1-alkyl-3-methylimidazolium tetrafluoroborates ([Cnmim][BF4], n = 4, 6, 10). It is found that apart from the inherent micropore, large mesoporous structure has been produced in the COFs...
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A highly regioselective, solvent free and montmorillonite K10 clay catalysed domino process with an unprecedented ring closing C-C bond formation reaction is described for the synthesis of new class of 1,3,4-trisubstituted and 1,4-disubstituted pyrazole derivatives. The reaction proceeds via a nucleophilic attack of enamine from an intermediate on the β carbon of an amino acrylate. Experimental outcome has clearly revealed that the organic solvents produce adverse effect for the pyrazole formati...
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#1Uttam Kumar DasH-Index: 8
#2Trevor JanesH-Index: 3
Last. David MilsteinH-Index: 73
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Herein we report the selective hydrogenation of cyclic imides to diols and amines, homogeneously catalyzed for the first time by a complex of an earth-abundant metal, a manganese pincer complex. A plausible catalytic cycle is proposed based on informative mechanistic experiments.
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#1Filipa A. VicenteH-Index: 6
#2Igor PlazlH-Index: 17
Last. Sónia P. M. VenturaH-Index: 31
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Separation and purification of biomacromolecules either in biopharmaceuticals and fine chemicals manufacturing, or in diagnosis and biological characterization, can substantially benefit from application of microfluidic devices. Small volumes of equipment, very efficient mass and heat transfer together with high process control result in process intensification, high throughputs, low energy consumption and reduced waste production as compared to conventional processing. This review highlights mi...
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#2Mengmeng HuangH-Index: 9
Last. Yangjie WuH-Index: 41
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A visible-light induced green and efficient method is developed for the synthesis of α-indolyl diethyl malonates. The reaction proceeds without any photocatalysts or ligands in green solvent in short time. Moreover, the reaction mechanism has been clearly studied by control experiments, spectrophotometric studies and density functional theory (DFT) calculations. The results showed that the photocatalyst-free transformation may proceed via an XB-promoted radical process. The EDA complex formation...
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#2Fei XuH-Index: 8
Last. Zengxi LiH-Index: 17
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The conversion of biomass and carbon dioxide to plastics is one of the key solutions to reduce the greenhouse effect and alleviate the petroleum resource depletion. However, there is still a lack of bioderived polymers with high molecular weight, excellent performance and their corresponding green synthesis process, thus which limits the potential of bioderived polymers to replace petroleum-based polymers. In this paper, an eco-friendly synthetic process for bioderived polycarbonate catalyzed by...
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#1José S.S. NetoH-Index: 9
#2Renata A. BalaguezH-Index: 5
Last. Antonio L. BragaH-Index: 42
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Herein, we describe an efficient, rapid and benign protocol for the direct C(sp2)-H bond halogenation (Cl,Br,I) of 2-arylimidazo[1,2-a]pyridines using trihaloisocyanuric acids in ethanol. Furthermore, this sustainable protocol was successfully extended to imidazopyrimidine, imidazothiazole and indazole heterocycles showing the broadness of this useful approach.
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UNSATURATED, CARBONYL AND AROMATIC PRODUCTS WERE OBTAINED BY REACTING 1-BUTANOL OR 1-BUTANOL:METHANOL MIXTURE WITH A COPPER MIXED METAL OXIDE CATALYST IN A FIXED BED REACTOR. THE SELECTIVITIES OBSERVED, MOSTLY FOR THE UNSATURATED AND CARBONYL PRODUCTS, CAN REPRESENT A NEW ALTERNATIVE AND GREENER PATHWAY FOR FINE-CHEMICALS AND ORGANIC BUILDING BLOCKS PRODUCTION.
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