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Chemical Communications: Chem Comm

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https://www.readbyqxmd.com/read/28234400/electrochemical-11-c-co2-to-11-c-co-conversion-for-pet-imaging
#1
David A Anders, Salvatore Bongarzone, Robin Fortt, Antony D Gee, Nicholas J Long
The development of a novel electrochemical methodology to generate carbon-11 carbon monoxide ([(11)C]CO) from cyclotron-produced carbon-11 carbon dioxide ([(11)C]CO2) using Ni(cyclam) and Zn(cyclen) complexes is described. This methodology allows up to 10% yields of [(11)C]CO from [(11)C]CO2. Produced [(11)C]CO was subsequently converted to [(11)C]N-benzylbenzamide under mild conditions with a radiochemical purity (RCP) of >98%.
February 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28233007/coupling-polymorphic-nanostructured-carbon-nitrides-into-an-isotype-heterojunction-with-boosted-photocatalytic-h2-evolution
#2
Jianhai Wang, Yile Chen, Yanfei Shen, Songqin Liu, Yuanjian Zhang
A heterojunction photocatalyst made up of a single substrate is reported. The heterointerfaces of carbon nitride (CN) are natively compatible due to their very similar chemical and crystalline structures. Moreover, the varieties in the nanostructures of CN led to different energy levels that not only matched well with each other but also enabled a sufficient internal electric field at their interfaces to suppress unwanted recombination of charge carriers in photocatalysis.
February 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28233000/improved-photodynamic-activities-of-liposome-incorporated-60-fullerene-derivatives-bearing-a-polar-group
#3
Atsushi Ikeda, Tomoya Mae, Masafumi Ueda, Kouta Sugikawa, Hajime Shigeto, Hisakage Funabashi, Akio Kuroda, Motofusa Akiyama
[60]Fullerene (C60) derivatives were incorporated into liposomes using a fullerene exchange method involving the transfer of the fullerene from the cavity of two γ-cyclodextrin molecules to a liposome. A lipid-membrane-incorporated C60 derivative bearing a polar group showed much higher photodynamic activity than the analogous system incorporating pristine C60.
February 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28232997/electrochemical-synthesis-of-benzoxazoles-from-anilides-a-new-approach-to-employ-amidyl-radical-intermediates
#4
Tile Gieshoff, Anton Kehl, Dieter Schollmeyer, Kevin D Moeller, Siegfried R Waldvogel
A novel electrochemical method for the synthesis of benzoxazoles from readily available anilides is reported. Various functionalities are tolerated and good yields can be achieved. By employing common electrode materials and a simple constant current protocol, this method is an attractive new alternative to conventional pathways.
February 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28232994/cytotoxicity-of-arsenic-trioxide-in-single-leukemia-cells-by-time-resolved-icp-ms-together-with-lanthanide-tags
#5
Ying Zhou, Hongyan Li, Hongzhe Sun
A novel strategy using cisplatin as a viability dye together with conjugating lanthanide tags to marker proteins was developed to examine As2O3 cytotoxicity in single NB4/HL60 cells via ICP-MS. A positive correlation among intracellular arsenic contents, the ratios of apoptosis and death cells provides a basis for the design of more effective arsenic drugs.
February 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28229150/a-new-and-potentially-prebiotic-%C3%AE-cytidine-derivative
#6
Maria Tsanakopoulou, Jianfeng Xu, Andrew D Bond, John D Sutherland
A new α-cytidine derivative was synthesised from the prebiotic reaction of ribose aminooxazoline and dicyanoacetylene. The tetracyclic structure of the product was confirmed by X-ray diffraction and then an alternative 6-step synthetic pathway to the product was found which was suitable for large-scale synthesis.
February 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28229147/carbodiphosphorane-mediated-synthesis-of-a-triflyloxyphosphonium-dication-and-its-reactivity-towards-nucleophiles
#7
S Yogendra, F Hennersdorf, A Bauzá, A Frontera, R Fischer, J J Weigand
A carbodiphosphorane ((Ph3P)2C) mediated synthesis of the first triflyloxyphosphonium dication (12+) bearing two electrophilic sites is presented. Depending on the nucleophile, 12+ reacts selectively either at the sulfur atom of the triflyloxy moiety or at the directly attached phosphorus atom. In substitution reactions at the phosphorus atom the triflyloxy moiety serves as a leaving group and enables the synthesis of rare examples of pseudo-halophosphonium dications.
February 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28229143/metal-free-nitroxyl-radical-mediated-%C3%AE-c-sp-3-h-amination-of-saturated-ketones-with-heteroaryl-halides-multiple-roles-of-tempo
#8
Ping Qian, Yu Deng, Haibo Mei, Jianlin Han, Yi Pan
The first metal-free nitroxyl-radical-mediated β-amination of saturated ketones by using heteroaryl halides as amide precursors has been developed. This reaction proceeds through a cascade α-aminoxylation/Cope-like elimination/aza-Michael addition sequence to afford β-amino ketone derivatives with excellent yields. TEMPO plays multiple roles in the current β-amination process, including those of an oxidant, an α-aminoxylation reagent, a β-hydrogen acceptor, an in situ base, and an oxygen source.
February 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28229136/pt-nanoparticles-immobilized-in-mesostructured-silica-a-non-leaching-catalyst-for-1-octene-hydrosilylation
#9
Thomas Galeandro-Diamant, Reine Sayah, Marie-Line Zanota, Sébastien Marrot, Laurent Veyre, Chloé Thieuleux, Valérie Meille
A catalyst containing small (ca. 2.5 nm) and crystalline Pt nanoparticles embedded into the walls of a mesostructured silica framework was found to be highly active in alkene hydrosilylation reaching TONs of ca. 10(5). More importantly, no Pt leaching was detected. This result is remarkable because Pt leaching is a recurrent problem in alkene hydrosilylation, which often prevents heterogeneous catalysts from being used industrially. This result is in contrast to the significant Pt leaching observed for other Pt/SiO2 catalysts...
February 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28225551/rational-design-and-controllable-preparation-of-holey-mno2-nanosheets
#10
Gaini Zhang, Lijun Ren, Zhe Yan, Liping Kang, Zhibin Lei, Hua Xu, Feng Shi, Zong-Huai Liu
A novel technique for the design and controllable preparation of holey MnO2 nanosheets was first developed by an in situ redox reaction between the MnO2 nanosheets and adsorbed Fe(2+) ions at room temperature, in which Fe(2+) ions originated from a redox reaction between Cu wire and Fe(3+) ions. The formation of in-plane nanopores on the MnO2 nanosheets obviously improved the rate capability when they were used as promising supercapacitor electrodes.
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28225144/molecular-and-genetic-basis-for-early-stage-structural-diversifications-in-hapalindole-type-alkaloid-biogenesis
#11
Qin Zhu, Xinyu Liu
Heterologous expressions and purifications of all WelU proteins from the welwitindolinone pathways in Hapalosiphon welwitschii UTEX B1830 and IC-52-3 led to the discovery that WelU1 and WelU3 selectively assemble 12-epi-fischerindole U (2) and 12-epi-hapalindole C (1), respectively, from 3-geranyl 3-isocyanovinyl indolenine (4) via an enzymatic cascade featuring the Cope rearrangement, stereoselective aza-Prins cyclization and regioselective carbocation deposition. In combination with the in vitro characterization of WelU1/WelU3-homolog AmbU4 for the biogenesis of 12-epi-hapalindole U, this study provide a unified view on the origin of the early stage structural diversifications in hapalindole-type alkaloid biosynthesis, post common intermediate 4...
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28225137/correction-enhanced-resistive-switching-effect-upon-illumination-in-self-assembled-niwo4-nano-nests
#12
Bai Sun, Wenxi Zhao, Lujun Wei, Hongwei Li, Peng Chen
Correction for 'Enhanced resistive switching effect upon illumination in self-assembled NiWO4 nano-nests' by Bai Sun et al., Chem. Commun., 2014, 50, 13142-13145.
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28225132/an-unexpected-use-of-ferrocene-a-scanning-electrochemical-microscopy-study-of-a-toll-like-receptor-array-and-its-interaction-with-e-coli
#13
Zhe She, Kristin Topping, Bin Dong, Mohtashim H Shamsi, Heinz-Bernhard Kraatz
Imaging of toll-like receptor microarrays was achieved using scanning electrochemical microscopy with the successful integration of two ferrocene derivatives in order to enhance the background contrast. This investigation has resulted in the novel fabrication of a tuneable, multiplex, broad-spectrum bacterial sensor for the interrogation of conserved microbial stimuli.
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28225129/one-pot-conversion-of-biomass-derived-xylose-and-furfural-into-levulinate-esters-via-acid-catalysis
#14
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/28225122/aromatic-metamorphosis-conversion-of-an-aromatic-skeleton-into-a-different-ring-system
#15
Keisuke Nogi, Hideki Yorimitsu
Aromatic skeletons are generally regarded as being uncleavable because of their aromatic stabilization energy. Compared to exocyclic functionalizations of aromatic compounds, much less attention has been paid to substitutions of endocyclic atoms in aromatic cores through partial disassembly of the cyclic skeletons and subsequent ring reconstruction. In this Feature Article, we describe our endeavours to establish "aromatic metamorphosis", where general aromatic compounds such as dibenzothiophenes, dibenzofurans, and benzofurans are transformed into different ring systems using a multi-step strategy or ideally in one step...
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28225097/synthesis-and-structure-of-synthetically-pure-and-deuterated-amorphous-basic-calcium-carbonates
#16
Hsiu-Wen Wang, Luke L Daemen, Michael C Cheshire, Michelle K Kidder, Andrew G Stack, Lawrence F Allard, Jörg Neuefeind, Daniel Olds, Jue Liu, Katharine Page
It is generally believed that H2O and OH(-) are the key species stabilizing and controlling amorphous calcium carbonate "polyamorph" forms, and may in turn control the ultimate crystallization products during synthesis and in natural systems. Yet, the locations and hydrogen-bonding network of these species in ACC have never been measured directly using neutron diffraction. We report a synthesis route that overcomes the existing challenges with respect to yield quantities and deuteration, both of which are critically necessary for high quality neutron studies...
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28225096/dimension-controlled-ion-pairing-assemblies-based-on-%C3%AF-electronic-charged-species
#17
Yohei Haketa, Hiromitsu Maeda
This feature article summarizes the recent progress in the study of ion-pairing assemblies based on π-electronic ion pairs, including anion complexes of π-electronic molecules. Recently, ionic self-assembly (or ion-pairing assembly) has been widely investigated and utilized in the fabrication of various functional materials including soft materials, surface morphologies and organic-inorganic hybrid materials. It is significantly important to precisely design and synthesize charged π-electronic systems for obtaining highly organized assemblies, but the development of π-electronic ion pairs with an aim to fabricate soft materials has hardly been examined...
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28224140/a-novel-strategy-for-high-performance-transparent-conductive-films-based-on-double-walled-carbon-nanotubes
#18
Yuan He, Hehua Jin, Song Qiu, Qingwen Li
A high concentration of double-walled carbon nanotubes was dispersed by a carbazole-based conjugated polymer. And a transparent conductive film was fabricated via simple dip-coating using this dispersion, which showed simultaneously a low sheet resistance (average 134 Ω □(-1), minimal 86 Ω □(-1)) and an ultrahigh transmittance (99% at 550 nm). This high-performance transparent conductive film has potential applications in future optoelectronic devices demanding ultrahigh transparency and flexibility.
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28220181/a-versatile-size-coded-flow-cytometric-bead-assay-for-simultaneous-detection-of-multiple-micrornas-coupled-with-a-two-step-cascading-signal-amplification
#19
Liying Qiu, Yuecheng Zhang, Chenghui Liu, Zhengping Li
A versatile flow cytometric bead assay is developed for the sensitive and simultaneous detection of multiple microRNAs that combines an elegant enzyme-mediated cascading signal amplification on magnetic beads with a novel bead size-encoding mechanism.
February 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28220177/facile-synthesis-of-novel-bowl-like-hollow-carbon-spheres-by-the-combination-of-hydrothermal-carbonization-and-soft-templating
#20
Zili Zhang, Mingli Qin, Baorui Jia, Hongzhou Zhang, Haoyang Wu, Xuanhui Qu
For the first time, bowl-like hollow carbon spheres (BHCSs) have been designed and fabricated by the combination of hydrothermal carbonization and soft templating. The obtained BHCSs exhibit well-defined shapes with the size ranging from 1 to 2 μm. As electrodes of electrochemical double layer capacitors they showed good performance.
February 21, 2017: Chemical Communications: Chem Comm
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