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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/28745452/recent-progress-in-application-of-graphene-supported-metal-nanoparticles-in-c-c-and-c-x-coupling-reactions
#1
REVIEW
Mahmoud Nasrollahzadeh, Zahra Issaabadi, Mohammad Mostafa Tohidi, S Mohammad Sajadi
The carbon-carbon and carbon-heteroatom bonds catalytic formation is among the most significant reactions in organic synthesis which extensively applied for synthesis of natural products, heterocycles, dendrimers, biologically active molecules and useful compounds. This review provides the latest advances in the preparation of graphene supported metal nanoparticles and their application in the catalytic formation of both carbon-carbon (C-C) and carbon-heteroatom (C-X) bonds including the Suzuki, Heck, Hiyama, Ullmann, Buchwald and Sonogashira coupling reactions...
July 26, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28719073/our-contributions-in-nanochemistry-for-antibiosis-electrocatalyst-and-energy-storage-materials
#2
REVIEW
Jian Zhang, Jing Xu, Yan Wang, Huaiguo Xue, Huan Pang
This account mainly introduces and reviews our recent progress in three projects: antibacterial nanomaterial, electrocatalyst for detecting and electrode nanomaterial of energy storage device, especially the supercapacitor. Besides, our thought and idea about the design, fabrication and application of corresponding nanomaterials are sketched throughout the whole article in order to reveal the structure-function relationship and corresponding mechanism. In the end, we tend to attach importance to the bottleneck of nanomaterial's development and put forward our understanding in this field...
July 18, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28707370/chiral-manganese-aminopyridine-complexes-the-versatile-catalysts-of-chemo-and-stereoselective-oxidations-with-h2-o2
#3
REVIEW
Roman V Ottenbacher, Evgenii P Talsi, Konstantin P Bryliakov
In the last decade, manganese(II) complexes with N-donor tetradentate aminopyridine ligands emerged as efficient catalysts of enantioselective epoxidation of olefins and direct selective oxidation of C-H groups in complex organic molecules, with environmentally benign oxidant hydrogen peroxide. In this personal account, we summarize the progress of these catalysts with regard to ligands design, structure-reactivity correlations, evaluation of the substrate scope, as well as mechanistic studies, shedding light on the nature of active sites and the mechanisms of selective oxygenations...
July 14, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28685965/high-spatial-resolution-mass-spectrometry-imaging-toward-single-cell-metabolomics-in-plant-tissues
#4
REVIEW
Rebecca L Hansen, Young Jin Lee
Mass spectrometry imaging (MSI) is a powerful tool that has advanced our understanding of complex biological processes by enabling unprecedented details of metabolic biology to be uncovered. Through the use of high-spatial resolution MSI, metabolite localizations can be obtained with high precision. Here we describe our recent progress to enhance the spatial resolution of matrix-assisted laser desorption/ionization (MALDI) MSI from ∼50 μm with the commercial configuration to ∼5 μm. Additionally, we describe our efforts to develop a 'multiplex MSI' data acquisition method to allow more chemical information to be obtained on a single tissue in a single instrument run, and the development of new matrices to improve the ionization efficiency for a variety of small molecule metabolites...
July 7, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28681990/c-h-activation-and-alkyne-annulation-via-automatic-or-intrinsic-directing-groups-towards-high-step-economy
#5
REVIEW
Liyao Zheng, Ruimao Hua
Direct transformation of carbon-hydrogen bond (C-H) has emerged to be a trend for construction of molecules from building blocks with no or less prefunctionalization, leading high atom and step economy. Directing group (DG) strategy is widely used to achieve higher reactivity and selectivity, but additional steps are usually needed for installation and/or cleavage of DGs, limiting step economy of the overall transformation. To meet this challenge, we proposed a concept of automatic DG (DG(auto) ), which is auto-installed and/or auto-cleavable...
July 6, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28675576/polymer-nanoassembly-as-delivery-systems-and-anti-bacterial-toolbox-from-pgmas-to-msn-pgmas
#6
REVIEW
Ming-Xue Wu, Xin Wang, Ying-Wei Yang
Researches on cargo delivery systems have received burgeoning attention and advanced rapidly. For synthetic nanodevices, polymer nanoassemblies and their inorganic-organic hybrid materials, especially smart mesoporous silica nanoparticle (MSN)-polymer hybrids (e. g., MSN@PGMAs), have attracted increasing attention in recent years. Their superior characteristics and unique features such as dynamic transition of morphology endow them the ability to efficiently entrap cargo molecules and undergo smart cargo delivery and release in response to various external stimuli...
July 4, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28675550/single-handed-helical-carbonaceous-nanotubes-preparation-optical-activity-and-applications
#7
REVIEW
Yi Li, Yonggang Yang
Carbon-based nanomaterials have been widely studied in the past decade. Three approaches have been developed for the preparation of single-handed helical carbonaceous nanotubes. The first approach uses the carbonization of organopolymeric nanotubes, where the organic polymers are polypyrrole, 3-aminophenol-formaldehyde resin, and m-diaminobenzene-formaldehyde resin. The second approach uses the carbonization of aromatic ring-bridged polybissilsesquioxane followed by the removal of silica. Micropores exist within the walls of the carbonaceous nanotubes...
July 4, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28661074/a-review-of-recent-developments-of-mesoporous-materials
#8
REVIEW
Steven L Suib
This personal account concerns novel recent discoveries in the area of mesoporous materials. Most of the papers discussed have been published within the last two to three years. A major emphasis of most of these papers is the synthesis of unique mesoporous materials by a variety of synthetic methods. Many of these articles focus on the control of the pore sizes and shapes of mesoporous materials. Synthetic methods of various types have been used for such control of porosity including soft templating, hard templating, nano-casting, electrochemical methods, surface functionalization, and trapping of species in pores...
June 29, 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
#9
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...
June 26, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28650100/tautomerization-and-dissociation-of-molecular-peptide-radical-cations
#10
REVIEW
Xiaoyan Mu, Tao Song, Chi-Kit Siu, Ivan K Chu
Radical-mediated dissociations of peptide radical cations have intriguing unimolecular gas phase chemistry, with cleavages of almost every bond of the peptide backbone and amino acid side chains in a competitive and apparently "stochastic" manner. Challenges of unraveling mechanistic details are related to complex tautomerizations prior to dissociations. Recent conjunctions of experimental and theoretical investigations have revealed the existence of non-interconvertible isobaric tautomers with a variety of radical-site-specific initial structures, generated from dissociative electron transfer of ternary metal-ligand-peptide complexes...
June 26, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28639363/in-situ-generated-and-premade-1-copper-i-alkynes-in-cycloadditions
#11
REVIEW
Xinyan Wang, Xingyong Wang, Xuesong Wang, Jianlan Zhang, Chulong Liu, Yuefei Hu
The copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) was discovered in 2002, which has become the most remarkable example for "click chemistry" to date. In CuAAC reaction, 1-copper(I) alkyne has been recognized to be a key intermediate. However, many contradictory experimental results for this intermediate were reported in literature. For example, only the in-situ generated 1-copper(I) alkyne was used, while the premade 1-copper(I) alkyne proved to be inefficient under the standard conditions. The kinetic studies indicated that CuAAC reaction had a strict second-order dependence on Cu(I) and the DFT studies demonstrated that 1-copper(I) alkyne intermediate should be a dinuclear copper(I) complex...
June 22, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28608630/precisely-tailored-dna-nanostructures-and-their-theranostic-applications
#12
REVIEW
Bing Zhu, Lihua Wang, Jiang Li, Chunhai Fan
A critical challenge in nanotechnology is the limited precision and controllability of the structural parameters, which brings about concerns in uniformity, reproducibility and performance. Self-assembled DNA nanostructures, as a newly emerged type of nano-biomaterials, possess low-nanometer precision, excellent programmability and addressability. They can precisely arrange various molecules and materials to form spatially ordered complex, resulting in unambiguous physical or chemical properties. Because of these, DNA nanostructures have shown great promise in numerous biomedical theranostic applications...
June 13, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28605572/manganese-mediated-homolytic-aromatic-substitution-with-phosphinylidenes
#13
REVIEW
Olivier Berger, Jean-Luc Montchamp
Carbon-phosphorus (C-P) bond-forming reactions via homolytic aromatic substitution (HAS) of non-functionalized substrates with phosphinylidene P(O)H compounds is becoming a useful synthetic tool for the preparation of aryl and heteroaryl phosphonates, phosphinates, and phosphine oxides. This review specifically covers recent work using manganese-mediated free radical processes. Several research groups employ expensive Mn(OAc)3 , whereas our own contributions focus on the novel and inexpensive Mn(OAc)2 /MnO2 system...
June 12, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28513996/conformational-dynamics-of-mrna-in-gene-expression-as-new-pharmaceutical-target
#14
REVIEW
Tamaki Endoh, Naoki Sugimoto
Gene expression involves concurrent and consecutive events of unidirectional nature, such as transcription occurring from 5' to 3' end and translation from N to C terminus. Recent functional studies have shown the importance of kinetically coupled nucleic acid folding events that influence gene expression processes. For example, mRNA conformational dynamics during transcription and translation regulate gene expression and subsequent protein functionalization. The structure, stability, and kinetic properties of nucleic acids are sensitive to the intracellular molecular environment and can be regulated by using artificially developed molecules...
May 17, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28508470/catalytic-asymmetric-inverse-electron-demand-hetero-diels-alder-reactions
#15
REVIEW
Mingsheng Xie, Lili Lin, Xiaoming Feng
In this review, the recent developments in catalytic asymmetric inverse-electron-demand hetero-Diels-Alder reaction, which is recognized as one of the most powerful routes to construct highly functionalized and enantioenriched six-membered heterocycles, are described. The article is organized on the basis of different kinds of electron-deficient heterodienes, including α,β-unsaturated ketones/aldehydes, o-benzoquinones, α,β-unsaturated imines, N-aryl imines, o-benzoqinone imides, and other aza-olefins.
May 16, 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
#16
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...
May 10, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28485131/physicochemical-nature-of-perfluoroalkyl-compounds-induced-by-fluorine
#17
REVIEW
Takeshi Hasegawa
Perfluoroalkyl (Rf ) compounds have unique characters represented by a significantly high hydrophobic property, which often makes us consider that Rf groups should be interacted with each other via the 'hydrophobic interaction' as found for a normal hydrocarbon. Due to a similar intuitive and simplistic speculation, the Rf -specific material properties have long been enveloped in darkness for comprehensive understanding, which should lucidly be discussed within a framework of physical chemistry. Here, we show studies on the stratified dipole arrays (SDA) theory, which readily explains the Rf -specific material characters in a comprehensive manner based on only a few fundamental physical parameters of fluorine...
May 9, 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...
May 8, 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...
May 3, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28452190/practical-synthesis-of-both-enantiomeric-amino-acid-mannich-and-aldol-derivatives-by-asymmetric-organocatalysis
#20
REVIEW
Yan Liu, Natarajan Arumugam, Abdulrahman I Almansour, Raju Suresh Kumar, Keiji Maruoka
In this account, we describe our recent developments in organocatalyzed asymmetric methodologies for the practical synthesis of both enantiomers. The synthesis of both enantiomeric products by using both enantiomeric catalysts is the most traditional way. In addition, use of two pseudoenantiomeric catalysts provides a more practical approach for the synthesis of both enantiomeric products. Even more efficient is the use of a single enantiomeric catalyst in the presence or absence of certain additives for obtaining both enantiomeric products...
April 27, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
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