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https://www.readbyqxmd.com/read/28225588/self-assembled-and-one-step-synthesis-of-interconnected-3d-network-of-fe3o4-reduced-graphene-oxide-nanosheets-hybrid-for-high-performance-supercapacitor-electrode
#1
Rajesh Kumar, Rajesh Kumar Singh, Alfredo R Vaz, Raluca Savu, Stanislav A Moshkalev
In the present work, we have synthesized three dimensional (3D) reduced graphene oxide nanosheets (rGO NSs) containing iron oxide nanoparticles (Fe3O4 NPs) hybrids (3D Fe3O4/rGO) by one-pot microwave approach. Structural and morphological studies reveal that the as-synthesized Fe3O4/rGO hybrids were composed of faceted Fe3O4 NPs induced into the interconnected network of rGO NSs. The morphologies and structures of the 3D hybrids have been characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectrometer (XPS)...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28225279/cubr-catalyzed-aerobic-decarboxylative-cycloaddition-for-the-synthesis-of-indolizines-under-solvent-free-conditions
#2
Wenhui Wang, Junwen Han, Jinwei Sun, Yun Liu
An efficient synthesis of diversified indolizine derivatives were developed via CuBr-catalyzed reaction of pyridines, methyl ketones and alkenoic acids under solvent-free conditions in oxygen atmosphere. This synthesis involves cascade processes of copper-catalyzed bromination of the methyl ketone, 1,3-dipolar cycloaddition of the pyridinium ylide with the alkenoic acid followed by oxidative decarboxylation and dehydrogenative aromatization of the primary cycloadduct. By this protocol, a wide range of indoliznes with different substitution patterns were selectively prepared in one pot from simple substrates in good to excellent yields...
February 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28225218/synthesis-of-n-n-dialkylamino-nor-dihydroxanthene-hemicyanine-fused-near-infrared-fluorophores-and-their-first-water-soluble-and-or-bioconjugatable-analogues
#3
Jean-Alexandre Richard, Michelle Jui Hsien Ong, Sylvain Debieu, Mathieu Moreau, Anthony Romieu
The effective synthesis of extended conjugated N,N-dialkylamino-nor-dihydroxanthene-based fluorophores is described from diversely functionalized salicylic aldehydes. The access to these original fluorescent derivatives proceeded in two steps through a one-pot construction of the unusual nor-dihydroxanthene (nor-DHX) scaffold followed by a diversification step providing a wide variety of nor-DHX-hemicyanine fused dyes emitting in the range 730-790 nm. The versatility of our approach has enabled a further extension to the late-stage introduction of negatively/positively charged polar groups onto their terminal nitrogen heterocyclic subunit giving access to the first water-soluble and/or bioconjugatable members of this emerging class of NIR fluorophores...
February 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28225212/one-pot-process-for-hydrodeoxygenation-of-lignin-to-alkanes-using-ru-based-bimetallic-and-bifunctional-catalysts-supported-on-zeolite-y
#4
Hongliang Wang, Hao Ruan, Maoqi Feng, Yuling Qin, Heather M Job, Langli Luo, Chongmin Wang, Mark H Engelhard, Erik Kuhn, Xiaowen Chen, Melvin P Tucker, Bin Yang
The synthesis of high-efficiency and low-cost catalysts for hydrodeoxygenation (HDO) of waste lignin into advanced biofuels is crucial for enhancing current biorefinery processes. Inexpensive transition metals, including Fe, Ni, Cu, Zn, were severally co-loaded with Ru on HY zeolite to form bimetallic and bifunctional catalysts. These catalysts were subsequently tested for HDO conversion of softwood lignin and several lignin model compounds. Results indicated that the inexpensive earth abundant metals could modulate the hydrogenolysis activity of Ru and decrease the yield of low molecular weight gaseous products...
February 22, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28225129/one-pot-conversion-of-biomass-derived-xylose-and-furfural-into-levulinate-esters-via-acid-catalysis
#5
Xun Hu, Shengjuan Jiang, Liping Wu, Shuai Wang, Chun-Zhu Li
Direct conversion of biomass-derived xylose and furfural into levulinic acid, a platform molecule, via acid-catalysis has been accomplished for the first time in dimethoxymethane/methanol. Dimethoxymethane acted as an electrophile to transform furfural into 5-hydroxymethylfurfural (HMF). Methanol suppressed both the polymerisation of the sugars/furans and the Aldol condensation of levulinic acid/ester.
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28224786/cisplatin-crosslinked-multifunctional-nanodrugplexes-for-combination-therapy
#6
Weiqi Zhang, Ching-Hsuan Tung
Combination therapy efficiently tackles cancer by hitting multiple action mechanisms. However, drugs administered, simultaneously or sequentially, may not reach the targeted sites with the desired dose and ratio. The outcomes of combination therapy could be improved with a polymeric nanoparticle, which can simultaneously transport an optimal combination of drugs. We have demonstrated a simple one-pot strategy to formulate nanomedicines based on platinum coordination and the non-covalent interactions of the drugs...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28224290/pediatric-ocular-trauma-score-as-a-prognostic-tool-in-the-management-of-pediatric-traumatic-cataracts
#7
Mehul A Shah, Rupesh Agrawal, Ryan Teoh, Shreya M Shah, Kashyap Patel, Satyam Gupta, Siddharth Gosai
OBJECTIVE: To introduce and validate the pediatric ocular trauma score (POTS) - a mathematical model to predict visual outcome trauma in children with traumatic cataract METHODS: In this retrospective cohort study, medical records of consecutive children with traumatic cataracts aged 18 and below were retrieved and analysed. Data collected included age, gender, visual acuity, anterior segment and posterior segment findings, nature of surgery, treatment for amblyopia, follow-up, and final outcome was recorded on a precoded data information sheet...
February 22, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28221807/mechanostereoselective-one-pot-synthesis-of-functionalized-head-to-head-cyclodextrin-3-rotaxanes-and-their-application-as-magnetic-resonance-imaging-contrast-agents
#8
Jean Wilfried Fredy, Jérémy Scelle, Gregory Ramniceanu, Bich-Thuy Doan, Célia S Bonnet, Éva Tóth, Mickaël Ménand, Matthieu Sollogoub, Guillaume Vives, Bernold Hasenknopf
A versatile, five-component, one-pot synthesis of cyclodextrin (CD) [3]rotaxanes using copper-catalyzed azide-alkyne cycloaddition has been developed. Head-to-head [3]rotaxanes of α-CD selectively functionalized by one or two gadolinium 1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid monoamide complexes were obtained mechanostereoselectively. The magnetic resonance imaging efficiency, expressed by the longitudinal proton relaxivity of the rotaxanes, was significantly improved as compared to the functionalized CD...
February 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/28221701/accelerated-combinatorial-high-throughput-star-polymer-synthesis-via-a-rapid-one-pot-sequential-aqueous-raft-rosa-raft-polymerization-scheme
#9
Steffen Cosson, Maarten Danial, Julien Rosselgong Saint-Amans, Justin J Cooper-White
Advanced polymerization methodologies, such as reversible addition-fragmentation transfer (RAFT), allow unprecedented control over star polymer composition, topology, and functionality. However, using RAFT to produce high throughput (HTP) combinatorial star polymer libraries remains, to date, impracticable due to several technical limitations. Herein, the methodology "rapid one-pot sequential aqueous RAFT" or "rosa-RAFT," in which well-defined homo-, copolymer, and mikto-arm star polymers can be prepared in very low to medium reaction volumes (50 µL to 2 mL) via an "arm-first" approach in air within minutes, is reported...
February 21, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28221046/supramolecular-anion-recognition-mediates-one-pot-synthesis-of-3-amino-1-2-4-triazolo-pyridines-from-thiosemicarbazides
#10
Komala Pandurangan, Anna B Aletti, Devis Montroni, Jonathan A Kitchen, Miguel Martínez-Calvo, Salvador Blasco, Thorfinnur Gunnlaugsson, Eoin M Scanlan
A facile one-pot synthesis of 3-amino-[1,2,4]-triazolo[4,3-a]pyridines from thiosemicarbazides through anion mediated synthesis is reported. Thiosemicarbazides derived from 2-hydrazino pyridine, 5-chloro 2-hydrazino pyridine, and 2-hydrazine quinoline were formed in situ as anion receptors in the presence of TBAF. Under microwave heating, thiosemicarbazides furnished the triazolo pyridines in good to moderate yields. The formation of the thiosemicarbazides hydrogen bonding anion receptors was critical in cascading the reaction toward the formation of the triazolo pyridines...
February 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/28221034/regioselective-1-4-conjugate-addition-of-grignard-reagents-to-%C3%AE-%C3%AE-%C3%AE-%C3%AE-dienones-and-%C3%AE-%C3%AE-%C3%AE-%C3%AE-dienyl-thiol-esters
#11
Emmanuel Amoah, R Karl Dieter
Alkyl Grignard reagents (Et, nBu, iPr, cyclohexyl), with the exception of tBuMgCl, undergo exclusive or exceptionally highly regioselective 1,4-addition reactions to α,β-γ,δ-unsaturated ketones, while aryl and heteroaryl Grignard reagents give mixed results ranging from exclusive 1,4-addition (1-naphthyl, 2-N-methylpyrrolyl) to regioselective 1,2-addition (2-furyl, 2:1). All alkyl, aryl, and heteroaryl Grignard reagents examined gave exclusive 1,4-addition reactions with α,β-γ,δ-unsaturated thiol esters, with the exception of tBuMgCl which gave an 80:20 mixture of 1,4-:1,6-addition products...
February 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28220698/copper-catalyzed-selenylation-of-imidazo-1-2-a-pyridines-with-selenium-powder-via-a-radical-pathway
#12
Pengfei Sun, Min Jiang, Wei Wei, Yuanyuan Min, Wen Zhang, Wanhui Li, Daoshan Yang, Hua Wang
A novel and efficient method for the synthesis of nitrogen heterocycle-fused benzo[b]selenophene and imidazo[1,2-a]pyridines has been initially developed through copper-catalyzed direct selenylation of 2-(2-bromophenyl)imidazo[1,2-a]pyridines via regioselective cleavage of C(sp2)-Br and C(sp2)-H bonds using readily available selenium powder as the selenylating reagents under ligand- and base-free conditions in air. Preliminary mechanistic investigations indicated that radical species were involved. The inexpensive and convenient copper-catalyzed approach provides a convenient and useful strategy for one-pot constructing biologically and optically interesting heterocycles containing benzo[b]selenophene and imidazo[1,2-a]pyridine motifs...
February 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28219034/preparation-of-core-shell-nanostructure-fe3o4-peg400-so3h-as-heterogeneous-and-magnetically-recyclable-nanocatalyst-for-one-pot-synthesis-of-substituted-pyrroles-by-paal-knorr-reaction-at-room-temperature
#13
Fahimeh Bonyasi, Malak Hekmati, Hojat Veisi
An efficient procedure has been proposed for the loading of sulfonic acid groups on the surface of polyethylene glycol 400 (PEG400)-encapsulated Fe3O4 nanoparticles to synthesize a core-shell Fe3O4@PEG400-SO3H nano catalyst. Surface functionalization of magnetic particles in such a way is a refined method of bridging the gap amongst heterogeneous and homogeneous catalysis. The procured nano catalyst was classified through Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), wavelength-dispersive X-ray spectroscopy (WDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), BET, and back titration...
February 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28218860/gold-copper-co-catalyzed-tandem-reactions-of-2-alkynylanilines-a%C3%A2-synthetic-strategy-for-the-c2-quaternary-indolin-3-ones
#14
Yi-Jin Li, Na Yan, Chun-Hua Liu, Yang Yu, Yu-Long Zhao
A new strategy for direct and highly efficient synthesis of 2,3'-bisindolin-3-ones has been developed via a gold/copper-co-catalyzed tandem reactions of 2-alkynylanilines using TBHP as the terminal oxidant and oxygen-atom source. The single-step process involves a novel tandem intermolecular nucleophilic addition, intramolecular cyclization/oxidative cross-dehydrogenative coupling where up to four new bonds and two indole rings were created simultaneously in one-pot manner. The reaction features a broad substrate scope, good functional group tolerance, and high atom-economy...
February 20, 2017: Organic Letters
https://www.readbyqxmd.com/read/28218858/formal-synthesis-of-%C3%A2-aplykurodinone-1-through-a-hetero-pauson-khand-cycloaddition-approach
#15
Cheng Tao, Jing Zhang, Xiaoming Chen, Huifei Wang, Yun Li, Bin Cheng, Hongbin Zhai
The tricyclic intermediate 2 has been synthesized in eight steps from known compound 6 in 20% overall yield. As such, this constitutes a highly efficient formal synthesis of (±)-aplykurodinone-1. This synthesis features a unique, one-pot, intramolecular hetero-Pauson-Khand reaction (h-PKR)/desilylation sequence to expeditiously construct the tricyclic framework, providing valuable insights for expanding the scope and boundaries of h-PKR.
February 20, 2017: Organic Letters
https://www.readbyqxmd.com/read/28218855/gold-catalyzed-cycloisomerization-1-5-h-migration-diels-alder-reaction-cascade-synthesis-of-complex-nitrogen-containing-heterocycles
#16
Shuyao Zhang, Beiming Cheng, Shen-An Wang, Ling Zhou, Chen-Ho Tung, Jianwu Wang, Zhenghu Xu
An unprecedented gold-catalyzed cycloisomerization/1,5-H migration/Diels-Alder reaction cascade has been developed that enables the rapid construction of complex nitrogen polycyclic compounds. This one-pot, three-step cascade reaction offers good yields of the products and is promoted by a single gold catalyst under very mild conditions.
February 20, 2017: Organic Letters
https://www.readbyqxmd.com/read/28218632/clinical-case-of-the-month-group-g-streptococcal-bacteremia-secondary-to-a-burn-wound-infection
#17
Paige Deichmann, Amol Sura, Charles Sanders, Nisha Aravindakshan-Patel, Fred Lopez
A 61-year-old man presented to the emergency department with second degree burns along his right arm and hand. He reported that his knees suddenly gave out while holding a pot of soup resulting in the scalding liquid spilling over his arm. His medical history is significant for alcohol abuse, chronic obstructive pulmonary disease, atrial fibrillation, congestive heart failure with preserved ejection fraction, chronic knee instability, and degenerative joint disease of the spine.
January 2017: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28218522/one-pot-cascade-synthesis-of-substituted-carbazoles-from-indoles-ketones-and-alkenes-using-oxygen-as-the-oxidant
#18
Shanping Chen, Yuxia Li, Penghui Ni, Baichuan Yang, Huawen Huang, Guo-Jun Deng
An efficient one-pot two-step indole-to-carbazole strategy has been developed. This transition metal-free methodology uses oxygen as the sole oxidant and starts from cheap and readily available indoles, ketones and alkenes. The present protocol efficiently enables the assembly of a diverse array of substituted carbazole products with good regioselectivity and broad tolerance of functional groups.
February 20, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28215565/towards-multifunctional-cellulosic-fabric-uv-photo-reduction-and-in-situ-synthesis-of-silver-nanoparticles-into-cellulose-fabrics
#19
Mohamed Rehan, Ahmed Barhoum, Guy Van Assche, Alain Dufresne, Linda Gätjen, Ralph Wilken
Herein, the highly multifunctional cotton fabric surfaces were designed with excellent coloration, UV-protection function, and antimicrobial activity. These multifunctional functions were developed by in-situ synthesis of silver nanoparticles (Ag NPs) into the cotton fabric surface using a simple green one-pot "UV-reduction" method. Cotton fabrics were pretreated with non-anionic detergent, immersed into alcoholic silver nitrate solution (concentration ranging from 100 to 500ppm), squeezed to remove excess solution and then exposed to UV-irradiation (range 320-400nm) for 1h...
February 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28214676/chiral-aminoquinoline-based-fluorescent-ph-probe-with-large-stokes-shift-for-bioimaging
#20
Yong-Sheng Xie, Xin-Ling Zhang, Kun Xie, Yanmei Zhao, Huan Wu, Jidong Yang
The aminoquinoline derivatives, (R)- and (S)-2-phenyl-2-(quinolin-6-ylamino)ethan-1-ol (R-PEO and S-PEO), were synthesized by a tandem one-pot three-step CN coupling method where Smiles rearrangement was the key procedure. The selected compound R-PEO showed a significant fluorescence enhancement with a turn-on ratio over 98-fold and enabled the real time determination of proton concentration in acidic solution. The fluorescence intensity of R-PEO exhibited strong pH-dependent performance with a large Stokes shift (115nm) and responded linearly to minor pH change within the range of 3...
February 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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