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https://www.readbyqxmd.com/read/28812900/single-reactant-replacement-approach-of-passerini-reaction-one-pot-synthesis-of-%C3%AE-acyloxyamides-and-phthalides
#1
Yangyong Shen, Bo Huang, Linwei Zeng, Sunliang Cui
The Passerini reaction is a classical and well-known multicomponent reaction for accessing α-acyloxy amides. A single reactant replacement (SRR) approach of Passerini reaction is described, which involves aldehydes, carboxylic acids, and ynamides to constitute a one-pot synthesis of β-acyloxy amides in a convergent manner. When this method was subject to intramolecular reaction, the process would produce phthalide products. The scalability was demonstrated, and a crossover reaction was conducted to elucidate a plausible mechanism...
August 16, 2017: Organic Letters
https://www.readbyqxmd.com/read/28812875/one-pot-synthesis-of-size-and-composition-controlled-ni-rich-nipt-alloy-nanoparticles-in-a-reverse-micro-emulsion-system-and-their-application
#2
Gregory M Biausque, Paco Laveille, Dalaver H Anjum, Bei Zhang, Xixiang Zhang, Valérie Caps, Jean-Marie Basset
Bimetallic nanoparticles have been the subject of numerous research studies in the nanotechnology field, in particular for catalytic applications. Control of the size, morphology and composition has become a key challenge due to the relationship between these parameters and the catalytic behavior of the particles in terms of activity, selectivity and stability. Here, we present a one-pot air synthesis of 2 nm Ni9Pt1 nanoparticles with a narrow size distribution. Control of the size and composition of the alloy particles is achieved at ambient temperature, in the aqueous phase, by the simultaneous reduction of nickel and platinum precursor with hydrazine, using a reverse micro-emulsion system...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28810193/kinetics-and-mechanism-of-antibacterial-activity-and-cytotoxicity-of-ag-rgo-nanocomposite
#3
Marjan Moghayedi, Elaheh K Goharshadi, Kiarash Ghazvini, Hossein Ahmadzadeh, Laleh Ranjbaran, Raheleh Masoudi, Ralf Ludwig
Nowadays, nanomaterials with remarkable antibacterial activity and low cytotoxicity attract much interest in research. By considering the antibacterial activity of Ag and graphene oxide (GO), the Ag-RGO nanocomposite was prepared by a one-pot and facile technique and it was used to evaluate its antibacterial activity and cytotoxicity against Escherichia coli and glioblastoma cancer cells (U87MG), respectively. The antibacterial activity was studied by micro-dilution and colony counting methods to investigate cell viability...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28809566/carbon-phosphorous-bond-formation-on-anilines-mediated-by-a-hypervalent-iodine-reagent
#4
Elsa Deruer, Siomenan Coulibali, Saad Boukercha, Sylvain Canesi
Substituted anilines containing a sulfonyl group may be oxidized in situ in the presence of methanol and a hypervalent iodine reagent to form an active iminium species. Subsequent addition of phosphines or phosphites in the same pot produces meta-substituted anilines in good yields. This formal C-H bond functionalization is a direct and efficient means of selectively substituting the meta-position of anilines to produce aromatic phosphonium ions or phosphonates.
August 15, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28809562/one-pot-synthesis-of-unsymmetric-diaryliodonium-salts-from-iodine-and-arenes
#5
Erik Lindstedt, Marcus Reitti, Berit Olofsson
The first synthesis of unsymmetric diaryliodonium salts directly from iodine and arenes is presented. The methodology provides diaryliodonium salts with the trimethoxyphenyl (TMP) moiety as dummy group. The protocol avoids the customary use of iodoarenes, which can be both expensive and toxic. Excess reagents are not required, and the reactions are performed under mild conditions. O-Arylations with these TMP salts were demonstrated to be highly chemoselective.
August 15, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28806661/low-cost-and-non-fluoride-flowerlike-superhydrophobic-particles-fabricated-for-both-emulsions-separation-and-dyes-adsorption
#6
Fei Guo, Qiuying Wen, Zhiguang Guo
Green fluoride-free superhydrophobic hierarchical flowerlike iron-containing MnO2 particles were synthesized by a simple one-pot approach and subsequently modified by stearic acid. The special selective wettability toward water and oil makes the particle can be used in oil-in-water emulsion separation. In addition, the particle also can be applied as absorption material to remove dyes which are serious water contaminants. More importantly, as for the mixture of emulsion and dye, the particles also have the ability to remove both oil and dye, making the particles potential for wastewater purification in the future...
August 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28805845/total-syntheses-of-gerberinol-i-and-the-pterophyllins-2-and-4-using-the-casnati-skatteb%C3%A3-l-reaction-under-different-conditions
#7
Jorgelina L Pergomet, Andrea B J Bracca, Teodoro S Kaufman
The concise and efficient total syntheses of the naturally-occurring coumarin derivatives gerberinol I, and the pterophyllins 2 and 4, from 5-methyl-4-hydroxycoumarin as a common precursor employing different Casnati-Skattebøl reaction conditions, are reported. The synthesis of the key intermediate coumarin was achieved by the organocatalytic condensation of acetylacetone and crotonaldehyde followed by a LiCl-assisted cyclization, CuCl2-promoted aromatization and a final Et2CO3-mediated cyclization. A Casnati-Skattebøl formylation under high-temperature conditions afforded gerberinol I, whereas milder conditions resulted in an unstable 3-formyl-4-hydroxycoumarin derivative, which was subjected to a basic alumina-mediated one pot O-alkylation with chloroacetone and intramolecular aldolization to furnish pterophyllin 4...
August 14, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28805367/tailoring-membrane-surface-properties-and-ultrafiltration-performances-via-self-assembly-of-polyethylene-glycol-block-polysulfone-block-polyethylene-glycol-block-copolymer-upon-thermal-and-solvent-annealing
#8
Ning Wang, Tao Wang, Yunxia Hu
Recently, ultrafiltration (UF) membranes faced great challenges including the fine control of the membrane surfaces for high filtration performances and antifouling properties in treating complex solution systems. Here, a particular type of amphiphilic block copolymers polyethylene glycol-block-polysulfone-block-polyethylene glycol (PEG-b-PSf-b-PEG) was synthesized through one-pot step-growth polymerization with mPEG as two ends to achieve the mobility of hydrophilic polymer chains. Without any other polymers or additives involved, the PEG-b-PSf-b-PEG triblock copolymer UF membrane was fabricated through the non-solvent induced phase separation (NIPS) method...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805218/electrochemical-de-lithiation-of-silver-ferrite-and-composites-mechanistic-insights-from-ex-situ-in-situ-and-operando-x-ray-techniques
#9
Jessica L Durham, Alexander B Brady, Christina A Cama, David C Bock, Christopher J Pelliccione, Qing Zhang, Mingyuan Ge, Yue Ru Li, Yiman Zhang, Hanfei Yan, Xiaojing Huang, Yong Chu, Esther S Takeuchi, Kenneth J Takeuchi, Amy C Marschilok
The structure of pristine AgFeO2 and phase makeup of Ag0.2FeO1.6 (a one-pot composite comprised of nanocrystalline stoichiometric AgFeO2 and amorphous γ-Fe2O3 phases) was investigated using synchrotron X-ray diffraction. A new stacking-fault model was proposed for AgFeO2 powder synthesized using the co-precipitation method. The lithiation/de-lithiation mechanisms of silver ferrite, AgFeO2 and Ag0.2FeO1.6 were investigated using ex situ, in situ, and operando characterization techniques. An amorphous γ-Fe2O3 component in the Ag0...
August 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28804906/efficacy-of-a-mephentermine-based-product-as-a-vasopressor-and-a-cardiac-performance-enhancer-when-given-intramuscularly-to-cattle
#10
D N Q Cunha, C L Del Rio, B L Youngblood, E L Ferris, G E Geist, Y Ueyama, L C Franz, S Mathur, R L Hamlin
The goal of this study was to confirm the vasopressor and cardiac effects of POTENAY(®) INJETÁVEL (POT), a mephentermine-based product, given to cattle with induced vascular/cardiac depression. Ten healthy Holstein cattle (206 ± 13 kg) followed a randomized-complete-block design (RCBD) utilizing crossover study design. Each animal randomly received (1 ml/25 kg, IM) of either POT (n = 10) or volume-matched placebo control (0.9%NaCl, CP, n = 10). A subset of animals (n = 5) received POT first (day 0) while the remaining (n = 5) received CP; after a six-day washout period, cattle received the opposite compound...
August 14, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28803465/hypervalent-iodine-mediated-chemoselective-iodination-of-alkynes
#11
Yan Liu, Daya Huang, Ju Huang, Keiji Maruoka
Reported herein are practical approaches for the chemoselective mono-, di-, and tri-iodination of alkynes based on efficient oxidative iodinations catalyzed by hypervalent iodine reagents. The reaction conditions were systematically optimized by altering the iodine source and/or the hypervalent iodine reagent system. The tetrabutylammonium iodide (TBAI)/(diacetoxyiodo)benzene (PIDA) system is specific for mono-iodination, while the KI/PIDA system results in di-iodination. Combining the TBAI/PIDA and KI/PIDA systems in one pot provided the corresponding tri-iodination products efficiently...
August 12, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28803379/effects-of-live-myriophyllum-aquaticum-and-its-straw-on-cadmium-accumulation-in-nasturtium-officinale
#12
Kewen Huang, Lijin Lin, Fabo Chen, Ming'an Liao, Jin Wang, Yi Tang, Yunsong Lai, Dong Liang, Hui Xia, Xun Wang, Wei Ren
The purpose of this study is to determine whether the allelopathy of living Myriophyllum aquaticum and its straw has the same effects; two pot experiments were conducted to study the effects of intercropping using M. aquaticum and its straw on the growth and cadmium (Cd) accumulation of Nasturtium officinale. Different planting ratios (1:3, 2:2 and 3:1) of N. officinale and M. aquaticum led to an increase in the biomass of both plant species and increased the Cd content in roots and shoots of N. officinale, but led to a reduction in the Cd content in roots and shoots of M...
August 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28802850/thermo-sensitive-chitosan-copolymer-gold-hybrid-nanoparticles-as-a-nanocarrier-for-delivery-of-erlotinib
#13
Marziyeh Fathi, Parham Sahandi Zangabad, Jaleh Barar, Ayuob Aghanejad, Hamid Erfan-Niya, Yadollah Omidi
Here, using (poly(N-isopropylacrylamide)-co-oleic acid)-g-chitosan ((PNIPAAm-co-OA)-g-CS), CS copolymer-gold hybrid nanoparticles (CGH NPs) were synthesized by autoreduction of auric cations (HAuCl4) in aqueous solution in the absence of any other reducing agent. The engineered thermo-sensitive CS copolymer with free amino groups could reduce auric cations and stabilized the resultant NPs. CGH NPs were prepared using different concentrations of CS copolymer (0.1-1% w/v) and HAuCl4 (50-500μL, 0.2% w/v). They were characterized in terms of structure, surface Plasmon band, zeta potential, atomic absorption, stability, size and size distribution...
August 9, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28802132/importance-of-intra-and-interspecific-plant-interactions-for-the-phytomanagement-of-semiarid-mine-tailings-using-the-tree-species-pinus-halepensis
#14
Duli Martinez-Oró, Isabel Parraga-Aguado, Jose Ignacio Querejeta, Héctor M Conesa
The objective of this work was to evaluate the effects of plant interactions (intra- and interspecific) on the growth and metal(loid) uptake of the tree species Pinus halepensis to determine its suitability for the phytomanagement of semiarid mine tailings. The pioneer tailings colonizer grass Piptatherum miliaceum was selected for assessing interspecific interactions. The experiment was conducted following a pot experimental design employing mine tailings soil. Pots containing single individuals of P. halepensis or P...
August 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28801822/simultaneous-quantification-of-free-cholesterol-cholesteryl-esters-and-triglycerides-without-ester-hydrolysis-by-uhplc-separation-and-in-source-collision-induced-dissociation-coupled-ms-ms
#15
Michael S Gardner, Lisa G McWilliams, Jeffrey I Jones, Zsuzsanna Kuklenyik, James L Pirkle, John R Barr
We demonstrate the application of in-source nitrogen collision-induced dissociation (CID) that eliminates the need for ester hydrolysis before simultaneous analysis of esterified cholesterol (EC) and triglycerides (TG) along with free cholesterol (FC) from human serum, using normal phase liquid chromatography (LC) coupled to atmospheric pressure chemical ionization (APCI) tandem mass spectrometry (MS/MS). The analysis requires only 50 μL of 1:100 dilute serum with a high-throughput, precipitation/evaporation/extraction protocol in one pot...
August 11, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28801597/mos2-rgo-nanoflakes-as-high-performance-anode-materials-in-sodium-ion-batteries
#16
Ruxing Wang, Shu Gao, Kangli Wang, Min Zhou, Shijie Cheng, Kai Jiang
A simple one-pot hydrothermal method is developed for fabrication of MoS2@rGO nanoflakes using the economical MoO3 as the molybdenum source. Benefiting from the unique nanoarchitecture, high MoS2 loading (90.3 wt%) and the expanded interlayer spacing, the as-prepared MoS2@rGO nanoflakes exhibit greatly enhanced sodium storage performances including a high reversible specific capacity of 441 mAh g(-1) at a current density of 0.2 A g(-1), high rate capability, and excellent capacity retention of 93.2% after 300 cycles...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800865/contemporary-reviews-in-critical-care-medicine-anaphylaxis
#17
REVIEW
Daniel LoVerde, Onyinye I Iweala, Ariana Eginli, Guha Krishnaswamy
Anaphylaxis is a systemic, life threatening disorder triggered by mediators released by mast cells and basophils activated via allergic (IgE-mediated) or non-allergic (non-IgE-mediated) mechanisms. It is a rapidly evolving, multisystem process involving the integumentary, pulmonary, gastrointestinal and cardiovascular systems. Anaphylaxis and angioedema are serious disorders that can lead to fatal airway obstruction and culminate in cardiorespiratory arrest resulting in hypoxemia and/or shock. Often, these disorders can be appropriately managed in an outpatient setting...
August 8, 2017: Chest
https://www.readbyqxmd.com/read/28800363/the-viability-of-lytic-bacteriophage-%C3%AE-d5-in-potato-associated-environments-and-its-effect-on-dickeya-solani-in-potato-solanum-tuberosum-l-plants
#18
Robert Czajkowski, Anna Smolarska, Zofia Ozymko
Dickeya solani is one of the most important pectinolytic phytopathogens responsible for high losses in potato, especially in seed potato production in Europe. Lytic bacteriophages can affect the structure of the host population and may influence spread, survival and virulence of the pathogen and in consequence, infection of the plant. In this study, we aimed to acquire information on the viability of the broad host lytic bacteriophage ΦD5 on potato, as well as to apprehend the specific effect of this bacteriophage on its host D...
2017: PloS One
https://www.readbyqxmd.com/read/28799668/ligand-influence-on-the-carbonyl-hydroboration-catalysis-by-alkali-metal-hydridotriphenylborates-l-m-hbph3-m-li-na-k
#19
Jun Okuda, Thomas Spaniol, Hassan Osseili, Debabrata Mukherjee
Alkali metal hydridotriphenylborates [(L1)M][HBPh3] (L1 = Me6TREN; M = Li, Na, K) chemoselectively catalyze the hydroboration of carbonyls and CO2, with lithium being the most active system. A new series of complexes [(L2)M][HBPh3] [M = Li (1), Na (2), K (3)] with the cyclen-derived macrocyclic polyamine Me4TACD (L2) were synthesized in a 'one-pot' fashion and fully characterized including X-ray crystallography. In the crystal, 1-3 exhibit wide variation in metal coordination of the [HBPh3] anion from lithium to potassium...
August 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28799333/atom-economic-palladium-carbon-catalysed-de-novo-synthesis-of-tri-substituted-nicotinonitriles
#20
Debayan Sarkar, Nilendri Rout, Manoj Kumar Ghosh, Santanab Giri, Kornelius Neue, Hans Reuter
A de novo Palladium carbon catalyzed synthesis of tri-substituted nicotinonitriles from easily synthesized homopropagylic or homoallylic aromatic alcohols in presence of nitriles has been explored. The mechanism proceeds with an interesting generation of Pd(II) -C palladacycle followed by an oxidative aromatization to generate the pyridine core. The pyridine core is generated with a noteworthy C-C bond cleavage incase with the substituted nitriles. The moderate yields and easy separation of the products delivers a unique importance to this one pot methodology...
August 11, 2017: Journal of Organic Chemistry
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