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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/28195390/self-assembly%C3%A2-of%C3%A2-renewable%C3%A2-nano-sized-triterpenoids
#1
REVIEW
Braja Gopal Bag, Rakhi Majumdar
Studies on plant metabolites have gained renewed interest in recent years because these can serve as renewable chemicals for the development of a sustainable society.Among various plant secondary metabolites, terpenoids constitute the major component and triterpenoids are the 30C subset of it.In recent years, triterpenoids have drawn the attention of scientific community due to many of its potential and realized applications in medicine, drug delivery, thermochromic materials, pollutant capture, catalysis, liquid crystals, etc...
February 14, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28169484/organocatalytic-hydrophosphonylation-reaction-of-carbonyl-groups
#2
REVIEW
Raquel P Herrera
This revision is covering the limited examples reported for a pivotal strategy in the formation of C-P bonds such as the asymmetric organocatalytic hydrophosphonylation of carbonyl groups (Pudovik reaction). The scope and limitations, and the proposed mechanisms for the scarce different possibilities of asymmetric induction are also shown. The recent evolution and future trends of this undeveloped approach are commented.
February 7, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28146343/catalytic-reaction-assisted-by-plasma-or-electric-field
#3
REVIEW
Shuhei Ogo, Yasushi Sekine
Direct conversion of methane, other hydrocarbons, and alcohol at lower temperatures can be achieved using plasma or an electric field and catalysts. Non-equilibrium plasma enables activation of stable molecules including methane, carbon dioxide, and water, even at low temperatures, by virtue of high electron energy. Use of a hybrid system of plasma and catalyst provided high conversion and selectivity to products by virtue of adsorption on the catalyst. Imposing a DC electric field to the catalyst bed also promotes catalytic reactions, even at low temperatures...
February 1, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28105702/hydrodynamic-effects-in-soft-matter-self-assembly-the-case-of-j-aggregates-of-amphiphilic-porphyrins
#4
REVIEW
Josep M Ribo, Zoubir El-Hachemi, Oriol Arteaga, Adolf Canillas, Joaquim Crusats
Chiral J-aggregates of achiral amphiphilic porphyrins (4-sulfonatophenyl and aryl meso-substituted porphyrins) show several effects under the hydrodynamic forces of common stirring. These effects can be classified as pure mechanic (e. g. elasticity, plasticity and breaking of the self-assembly non-covalent bonding) and chemically selective as detected in the formation/growth of the nanoparticles. Diastereoselective, enantioselective and, depending on the sign of chiral shear forces, even enantiospecific selections have been described...
January 20, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28075063/well-covered
#5
EDITORIAL
Brian P Johnson
No abstract text is available yet for this article.
January 11, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28074599/functionalization-of-c-h-bonds-by-photoredox-catalysis
#6
REVIEW
Qixue Qin, Heng Jiang, Zhentao Hu, Daan Ren, Shouyun Yu
Visible-light photoredox catalysis has been successfully used in the functionalization of inert C-H bonds including C(sp(2) )-H bonds of arenes and C(sp(3) )-H bonds of aliphatic compounds over the past decade. These transformations are typically promoted by the process of single-electron-transfer (SET) between substrates and photo-excited photocatalyst upon visible light irradiation (household bulbs or LEDs). Compared with other synthetic strategies, such as the transition-metal catalysis and traditional radical reactions, visible-light photoredox approach has distinct advantages in terms of operational simplicity and practicability...
January 11, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28054435/azobenzene-a-photoactive-building-block-for-supramolecular-architectures
#7
REVIEW
Massimo Baroncini, Giacomo Bergamini
The development of nanoscale systems capable to perform specific functions under external control is a challenging task and a fascinating objective in Chemistry. Photochromic compounds undergo radical changes in their physico-chemical properties upon light excitation, for this reason they are valuable building blocks for the construction of photo-controllable molecular devices, machines and materials. The E-Z photoisomerization of azobenzene has been known for almost 80 years and - owing to its high efficiency and excellent reversibility - has been widely employed to introduce an element of photo-control in a large variety of compounds, biomolecules, nanosystems and materials...
January 5, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28052561/asymmetric-multicomponent-reactions-based-on-trapping-of-active-intermediates
#8
REVIEW
Dan Zhang, Wenhao Hu
Metal carbenes derived from transition metal-catalyzed decomposition of diazo compounds react with nucleophiles with heteroatoms, such as alcohols and amines, to generate highly active oxonium/ammonium ylides intermediates. These intermediates can be trapped by appropriate electrophiles to provide three-component products. Based on this novel trapping process, we have developed novel multicomponent reactions (MCRs) of diazo compounds, alcohols/anilines, and electrophiles. The nucleophiles were also extended to electron-rich heterocycles (indoles and pyrroles)/arenes, in which the resulting zwitterionic intermediates were also trapped by electrophiles...
January 4, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28052541/emerging-of-inorganic-hole-transporting-materials-for-perovskite-solar-cells
#9
REVIEW
Ramireddy Rajeswari, Madoori Mrinalini, Seelam Prasanthkumar, Lingamallu Giribabu
Hole transporting material (HTM) is a significant component to achieve the high performance perovskite solar cells (PSCs). Over the years, inorganic, organic and hybrid (organic-inorganic) material based HTMs have been developed and investigated successfully. Today, perovskite solar cells achieved the efficiency of 22.1 % with with 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine) 9,9-spirobifluorene (spiro-OMeTAD) as HTM. Nevertheless, synthesis and cost of organic HTMs is a major challenging issue and therefore alternative materials are required...
January 4, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28042681/photodynamic-therapy-past-present-and-future
#10
REVIEW
Ushasri Chilakamarthi, Lingamallu Giribabu
Though we crossed many milestones in the field of medicine and health care in eradicating some deadly diseases over the past decades, cancer remained a challenge taking the lives of millions of people and having adverse effects on the quality of life of survivors. Chemotherapy and radiotherapy, the two existing major treatment modalities, have severe side effects and patients undergoing these treatments experience unbearable pain. Consequently, clinicians and researchers are working for the alternate treatment regimens, which can provide complete cure with minimum or no side effects...
January 2, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28028896/design-of-bioinorganic-materials-at-the-interface-of-coordination-and-biosupramolecular-chemistry
#11
REVIEW
Basudev Maity, Takafumi Ueno
Protein assemblies have recently become known as potential molecular scaffolds for applications in materials science and bio-nanotechnology. Efforts to design protein assemblies for construction of protein-based hybrid materials with metal ions, metal complexes, nanomaterials and proteins now represent a growing field with a common aim of providing novel functions and mimicking natural functions. However, the important roles of protein assemblies in coordination and biosupramolecular chemistry have not been systematically investigated and characterized...
December 28, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28000372/azidoimidazolinium-salts-safe-and-efficient-diazo-transfer-reagents-and-unique-azido-donors
#12
REVIEW
Mitsuru Kitamura
2-Azido-1,3-dimethylimidazolinium chloride (ADMC) and its corresponding hexafluorophosphate (ADMP) were found to be efficient diazo-transfer reagents to various organic compounds. ADMC was prepared by the reaction of 2-chloro-1,3-dimethylimidazolinium chloride (DMC) and sodium azide. ADMP was isolated as a crystal having good thermal stability and low explosibility. ADMC and ADMP reacted with 1,3-dicarbonyl compounds under mild basic conditions to give 2-diazo-1,3-dicarbonyl compounds in high yields, which were easily isolated in virtue of the high water solubility of the by-products...
December 21, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27996194/photoactivatable-substrates-a-material-based-approach-for-dissecting-cell-migration
#13
REVIEW
Jun Nakanishi
Photoactivatable substrates, which show changes in surface cell adhesiveness in response to photoirradiation, are promising platforms for cell manipulation with high spatiotemporal resolution. In addition to having applications in cell and tissue engineering, these materials are unique tools for basic biological sciences research, and they complement conventional genetic engineering technologies. One of the most useful applications is in the study of cell migration, which occurs in various physiological and pathological processes...
December 20, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27996185/chiral-lithium-amides-tuning-asymmetric-synthesis-on-the-basis-of-structural-parameters
#14
REVIEW
Anne Harrison-Marchand, Gabriella Barozzino-Consiglio, Jacques Maddaluno
An overview on the structural arrangements adopted by Chiral Lithium Amides (CLAs), alone or in mixed complexes, is presented. These species are important reagents for asymmetric synthesis and understanding their organization is essential to improve their design and the reaction conditions.
December 20, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27886443/introducing-barium-in-transition-metal-oxide-frameworks-impact-upon-superconductivity-magnetism-multiferroism-and-oxygen-diffusion-and-storage
#15
REVIEW
Bernard Raveau
The role of barium in the structural chemistry of some transition metal oxides of the series "Cu, Mn, Fe,Co" is reviewed, based on its size effect and its particular chemical bonding. Its impact upon various properties, superconductivity, magnetism, multiferroism, oxygen storage is emphasized.
November 25, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27886441/divergent-total-synthesis-of-atisane-type-diterpenoids
#16
REVIEW
Guili Zhu, Sachin B Wadavrao, Bo Liu
Atisane-type diterpenoids are the principal constituent of tetracyclic C20 -diterpenoids, widely isolated from the plant kingdom with varying degrees of structural complexity and pharmacological activity. The tetracarbocyclic system with the unique bicyclo[2.2.2]octane skeleton of this natural product family has generated interest within the synthetic community. Divergent total synthesis is an effective tactic to synthesize several atisane-type diterpenoids using structural interconversion from a common intermediate...
November 25, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27886438/self-assembly-of-bolaamphiphilic-molecules
#17
REVIEW
Prabhu Dhasaiyan, Bhagavatula L V Prasad
The current buzzword in science and technology is self-assembly and molecular self-assembly is one of the most prominent fields as far as research in chemical and biological sciences is concerned. Generally, self-assembly of molecules occurs through weak non-covalent interactions like hydrogen bonding, π-π stacking, hydrophobic effects, etc. Inspired by many natural systems consisting of self-assembled structures, scientists have been trying to understand their formation and mimic such processes in the laboratory to create functional "smart" materials, which respond to temperature, light, pH, electromagnetic field, mechanical stress, and/or chemical stimuli...
November 25, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27763716/catalytic-conversion-of-renewable-resources-into-bulk-and-fine-chemicals
#18
Johannes G de Vries
Several strategies can be chosen to convert renewable resources into chemicals. In this account, I exemplify the route that starts with so-called platform chemicals; these are relatively simple chemicals that can be produced in high yield, directly from renewable resources, either via fermentation or via chemical routes. They can be converted into the existing bulk chemicals in a very efficient manner using multistep catalytic conversions. Two examples are given of the conversion of sugars into nylon intermediates...
December 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27748035/special-issue-dedicated-to-professor-ryoji-noyori-on-the-15th-anniversary-of-his-nobel-prize-in-chemistry-introductory-remarks
#19
EDITORIAL
Takeshi Ohkuma
No abstract text is available yet for this article.
December 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27748019/transfer-hydrogenation-in-water
#20
Xiaofeng Wu, Chao Wang, Jianliang Xiao
This article provides an account of our group's efforts in developing aqueous-phase transfer hydrogenation reactions. It is comprised of mainly two parts. The first part concentrates on asymmetric transfer hydrogenation in water, enabled by Noyori-Ikariya catalysts, while the second part is concerned with the achiral version of the reaction catalysed by a new class of catalysts, iridacycles. A range of substrates are featured, including various carbonyl compounds and N-heterocycles.
December 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
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