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Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]

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https://www.readbyqxmd.com/read/29235236/copper-catalysis-and-organocatalysis-showing-the-way-synthesis-of-selenium-containing-highly-functionalized-1-2-3-triazoles
#1
REVIEW
Diego Alves, Bruna Goldani, Eder J Lenardão, Gelson Perin, Ricardo F Schumacher, Márcio W Paixão
This article provides a comprehensive overview of reported methods - particularly copper- and organocatalyzed reactions - for the regioselective syntheses of selenium-containing 1,2,3-triazoles systems. These chemical entities are prevalent cores in biologically active compounds and functional materials. In view of their unique properties, substantial efforts have been paid for the design and development of practical approaches for the synthesis of these scaffolds.
December 13, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29227031/innovative-sol-gel-routes-for-the-bottom-up-preparation-of-heterogeneous-catalysts
#2
REVIEW
Damien P Debecker
Heterogeneous catalysts can be prepared by different methods offering various levels of control on the final properties of the solid. In this account, we exemplify bottom-up preparation routes that are based on the sol-gel chemistry and allow to tailor some decisive properties of solid catalysts. First, an emulsion templating strategy is shown to lead to macrocellular self-standing monoliths with a macroscopic 3D structure. The latter can be used as catalyst or catalyst supports in flow chemistry, without requiring any subsequent shaping step...
December 11, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29205796/nanoarchitectonics-from-molecular-units-to-living-creature-like-motifs
#3
REVIEW
Katsuhiko Ariga, Taizo Mori, Lok Kumar Shrestha
Important points for the fabrication of functional materials are the creation of nanoscale/molecular-scale units and architecting them into functional materials and systems. Recently, a new conceptual paradigm, nanoarchitectonics, has been proposed to combine nanotechnology and other methodologies including supramolecular chemistry, self-assembly and self-organization to satisfy major features of nanoscience and promote the creation of functional materials and systems. In this account article, our recent research results in materials development based on the nanoarchitectonics concept are summarized in two stories, (i) nanoarchitectonics from fullerenes as the simplest nano-units and (ii) dimension-dependent nanoarchitectonics from various structural units...
December 4, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29205772/the-exploitation-of-enzymatically-derived-cis-1-2-dihydrocatechols-and-related-compounds-in-the-synthesis-of-biologically-active-natural-products
#4
REVIEW
Ehab S Taher, Martin G Banwell, Joshua N Buckler, Qiao Yan, Ping Lan
The title compounds of the general form 1 can be produced at large scale and in essentially enantiomerically pure form (when X≠H) through the whole cell biotransformation of the corresponding aromatic. The "dense" and varied functionality associated with these metabolites mean that they have become increasingly useful chirons for the total synthesis of a range of natural product types. This personal account details the outcomes of a nearly three-decade long campaign within our group to exploit these compounds in the synthesis of a diverse range of small molecule natural product targets...
December 4, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29194938/inorganic-hybridized-and-living-macrocellular-foams-out-of-the-box-heterogeneous-catalysis
#5
REVIEW
Armand Roucher, Martin Depardieu, Deniz Pekin, Mickaël Morvan, Rénal Backov
With this personal account we show how the Integrative Chemistry, when combining the sol-gel process and concentrated emulsions, allows to trigger inorganic, hybrid or living materials when dedicated toward heterogeneous catalysis applications. In here we focus on 3D-macrocellular monolithic foams bearing hierarchical porosities and applications thereof toward heterogeneous catalysis where both activities and mass transport are enhanced. We thereby first depict the general background of emulsions, focusing on concentrated ones, acting as soft templates for the design of solid (HIPE) foams, HIPE being the acronym for High Internal Phase Emulsions while encompassing both sol-gel and polymer chemistry...
December 1, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29171708/functional-carbon-quantum-dots-a-versatile-platform-for-chemosensing-and-biosensing
#6
REVIEW
Hui Feng, Zhaosheng Qian
Carbon quantum dot has emerged as a new promising fluorescent nanomaterial due to its excellent optical properties, outstanding biocompatibility and accessible fabrication methods, and has shown huge application perspective in a variety of areas, especially in chemosensing and biosensing applications. In this personal account, we give a brief overview of carbon quantum dots from its origin and preparation methods, present some advance on fluorescence origin of carbon quantum dots, and focus on development of chemosensors and biosensors based on functional carbon quantum dots...
November 24, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29171688/chemistry-in-confinement-copper-and-palladium-catalyzed-ecofriendly-organic-transformations-within-porous-frameworks
#7
REVIEW
Basuvaraj Suresh Kumar, Kasi Pitchumani
A concise account on the use of transition metals copper (Cu) and palladium (Pd), as their cations as well as nanoparticles exchanged/immobilized onto porous frameworks such as zeolites, metal organic frameworks (MOFs), covalent organic polymers (COPs) and hollow nanostructures, functioning as catalysts in organic synthesis is presented. This biomimetic account, "focusing on catalytic systems in confinement" within zero-dimensional microenvironments and second sphere coordination covers primarily results from our group on N-sulfonylketenimine mediated cycloaddition, hydrogenation and C-C bond forming reactions, thus providing an interesting insight into the versatility and utility of these Cu and Pd catalysts...
November 24, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29135061/transmembrane-signaling-with-lipid-bilayer-assemblies-as-a-platform-for-channel-based-biosensing
#8
REVIEW
Masao Sugawara
Artificial and natural lipid membranes that elicit transmembrane signaling is are useful as a platform for channel-based biosensing. In this account we summarize our research on the design of transmembrane signaling associated with lipid bilayer membranes containing nanopore-forming compounds. Channel-forming compounds, such as receptor ion-channels, channel-forming peptides and synthetic channels, are embedded in planar and spherical bilayer lipid membranes to develop highly sensitive and selective biosensing methods for a variety of analytes...
November 14, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29134769/study-of-the-air-tolerant-1-3-diphosphacyclobutane-2-4-diyl-through-the-direct-arylation
#9
REVIEW
Shigekazu Ito
Installing π-functional substituents on the skeletal phosphorus atoms of the air-tolerant 1,3-diphosphacyclobutane-2,4-diyl unit are promising for tuning the open-shell singlet P-heterocyclic chromophore. The sterically encumbered 1,3-diphosphaCycloButen-4-yl Anion (CBA), generated from the phosphorus-carbon triple bond, was available for the regioselective arylation via nucleophilic aromatic substitution (SN Ar) reaction, addition to arynes, and single-electron transfer (SET) process affording the corresponding P-arylated 1,3-diphosphacyclobutane-2,4-diyls...
November 14, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29124869/polydopamine-based-colloidal-materials-synthesis-and-applications
#10
REVIEW
Ziwei Deng, Bin Shang, Bo Peng
Polydopamine is a synthetic analogue of natural melanin (eumelanin) produced from oxidative polymerization of dopamine. Owing to its strong adhesion ability, versatile chemical reactivity, biocompatibility and biodegradation, polydopamine is commonly applied as a versatile linker to synthesize colloidal materials with diverse structures, unique physicochemical properties and tunable functions, which allow for a broad scope of applications including biomedicine, sensing, catalysis, environment and energy. In this personal account, we discuss first about the different synthetic approaches of polydopamine, as well as its polymerization mechanism, and then with a comprehensive overview of recent progress in the synthesis and applications of polydopamine-based colloidal materials...
November 10, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29044842/changing-perspectives-on-the-strategic-use-of-microwave-heating-in-organic-synthesis
#11
REVIEW
Gregory B Dudley, A E Stiegman
This Personal Account describes collaborative investigations into apocryphal microwave effects in organic chemistry. Focused research on microwave-assisted organic synthesis has been fraught with confusion, controversy, and misinformation. Microwave heating is an undoubtedly useful tactic for organic synthesis, but whether or not it can offer strategic advantages remains an open question in the minds of many people. (Ironically, those who do not consider it an open question are split as to whether it has been resolved affirmatively or negatively...
October 18, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29044977/plasmon-exciton-coupling-interaction-for-surface-catalytic-reactions
#12
REVIEW
Jingang Wang, Weihua Lin, Xuefeng Xu, Fengcai Ma, Mengtao Sun
In this review, we firstly reveal the physical principle of plasmon-exciton coupling interaction with steady absorption spectroscopy, and ultrafast transition absorption spectroscopy, based on the pump-prop technology. Secondly, we introduce the fabrication of electro-optical device of two-dimensional semiconductor-nanostructure noble metals hybrid, based on the plasmon-exciton coupling interactions. Thirdly, we introduce the applications of plasmon-exciton coupling interaction in the field of surface catalytic reactions...
October 16, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29024397/li4-ti5-o12-anode-structural-design-from-material-to-electrode-and-the-construction-of-energy-storage-devices
#13
REVIEW
Zhijie Chen, Honsen Li, Langyuan Wu, Xiaoxia Lu, Xiaogang Zhang
Spinel Li4 Ti5 O12 , known as a zero-strain material, is capable to be a competent anode material for promising applications in state-of-art electrochemical energy storage devices (EESDs). Compared with commercial graphite, spinel Li4 Ti5 O12 offers a high operating potential of ∼1.55 V vs Li/Li(+) , negligible volume expansion during Li(+) intercalation process and excellent thermal stability, leading to high safety and favorable cyclability. Despite the merits of Li4 Ti5 O12 been presented, there still remains the issue of Li4 Ti5 O12 suffering from poor electronic conductivity, manifesting disadvantageous rate performance...
October 12, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28929624/structural-mimics-of-phenyl-pyridine-ppy-substituted-phosphorescent-cyclometalated-homo-and-heteroleptic-iridium-iii-complexes-for-organic-light-emitting-diodes-an-overview
#14
REVIEW
Aravind Babu Kajjam, Sivakumar Vaidyanathan
Today organic light emitting diodes are a topic of significant academic and industrial research interest. OLED technology is used in commercially available displays, and efforts have been directed to improve this technology. Design and synthesis of phosphorescent based transition metals are capable of harvesting both singlet and triplet excitons and achieve 100 % internal quantum efficiency is an active area of research. Among all the transition metals, iridium is considered a prime candidate for OLEDs due to its prominent photophysical characteristics...
September 20, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28925581/advanced-materials-based-on-polymers-and-ionic-liquids
#15
REVIEW
Yuzo Kitazawa, Kazuhide Ueno, Masayoshi Watanabe
Ionic liquids (ILs) are ambient temperature molten salts, which have attracted considerable attention owing to their unique properties. In this contribution, we review advanced materials composed of ILs and polymers for the basis of a new design protocol to fabricate novel materials. As electrolytes for electrochemical devices, cross-linked polymers containing ILs (ion gels) are endowed with functional properties inherited from ILs and mechanical consistency derived from polymers. To create such materials, micro-phase separation of block copolymers and colloidal arrays in the ILs are utilized...
September 19, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28650571/development-of-proton-responsive-catalysts
#16
REVIEW
Lin Wang, Ryoichi Kanega, Hajime Kawanami, Yuichiro Himeda
A changeable ligand, which involves in activation of a catalyst or assists a reaction, draws an increasing attention, in contrast to a classical ligand as spectator. Proton-responsive catalysts, which are capable of undergoing changes of properties on gaining/losing one or more protons, provides interesting features as follows: (i) catalyst activation by electronic effect, (ii) pH-tuning of water-solubility, and (iii) second-coordination-sphere interaction. On the basis of this catalyst design concept, we developed several highly efficient proton-responsive catalysts for CO2 hydrogenation as H2 storage, formic acid (FA) dehydrogenation as H2 production, and transfer hydrogenation...
November 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28488753/cascades-of-interrupted-pummerer-reaction-sigmatropic-rearrangement
#17
REVIEW
Hideki Yorimitsu
A new class of Pummerer chemistry has emerged as a powerful tool in organic synthesis. The new technology consists of a beautiful cascade of an interrupted Pummerer reaction and the subsequent [3,3] sigmatropic rearrangement. The interrupted Pummerer reactions of alkenyl or aryl sulfoxides with unsaturated nucleophiles such as allylic silanes, ketones, and phenols provide sulfonium intermediates, which are ready to undergo smooth charge-accelerated [3,3] sigmatropic rearrangement with excellent to exclusive regioselectivity...
November 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28480626/helical-mesoporous-tantalum-oxide-nanotubes-formation-optical-activity-and-applications
#18
REVIEW
Yangyang He, Yonggang Yang
Nanomaterials with helical morphologies have attracted much attention owing to their potential applications as nanosprings, chirality sensors and in chiral optics. Single-handed helical Ta2 O5 nanotubes prepared through a supramolecular templating approach are described. The handedness is controlled by that of the organic self-assemblies of chiral low-molecular-weight gelators (LMWGs). The chiral LMWGs self-assemble into single-handed twisted nanoribbons through H-bonding, hydrophobic association, and π-π stacking...
November 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28467681/luminescent-strategies-for-label-free-g-quadruplex-based-enzyme-activity-sensing
#19
REVIEW
Dik-Lung Ma, Zhen-Zhen Dong, Kasipandi Vellaisamy, Ka-Man Cheung, Guanjun Yang, Chung-Hang Leung
By catalyzing highly specific and tightly controlled chemical reactions, enzymes are essential to maintaining normal cellular physiology. However, aberrant enzymatic activity can be linked to the pathogenesis of various diseases. Therefore, the unusual activity of particular enzymes can represent testable biomarkers for the diagnosis or screening of certain diseases. In recent years, G-quadruplex-based platforms have attracted wide attention for the monitoring of enzymatic activities. In this Personal Account, we discuss our group's works on the development of G-quadruplex-based sensing system for enzyme activities by using mainly iridium(III) complexes as luminescent label-free probes...
November 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28418111/toward-the-dark-matter-of-natural-products
#20
REVIEW
Toshiyuki Wakimoto
Considering the dynamic features of natural products, our access toward exploring the entire diversity of natural products has been quite limited. It is challenging to assess the diversity of natural products by using conventional analytical methods, even with tandem chromatographic techniques, such as LC-MS and GC-MS. This viewpoint is supported by the sequencing analyses of microbial genomes, which have unveiled the potential of secondary metabolite production far exceeding the number of isolated molecules...
November 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
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