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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/27886443/introducing-barium-in-transition-metal-oxide-frameworks-impact-upon-superconductivity-magnetism-multiferroism-and-oxygen-diffusion-and-storage
#1
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
#2
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
#3
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/27775874/cooperative-trifunctional-organocatalysts-for-proficient-proton-transfer-reactions
#4
Ryan Kenny, Fei Liu
Cooperativity is essential to proficient catalysis, and designing biomimetic, cooperative catalysis is a major avenue to finding new and efficient chemical reactions with practical applications. One challenge in designed cooperative catalysis is to access high catalytic proficiency (large enhancement in both rate and enantioselectivity) as seen in biocatalysis. Here described is an approach of developing and investigating trifunctional organocatalysts with three distinct catalytic functionalities, in order to understand how cooperativity could be organized for enantioselective activation that confers the observed proficiency in a tandem Michael-aldol-proton transfer elimination model reaction...
October 24, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27775863/ruthenium-catalyzed-metathesis-cascade-reactions-in-natural-products-synthesis
#5
Jing-Chun Han, Chuang-Chuang Li
In this account, we provide a brief summary of recent developments in ruthenium-catalyzed metathesis cascade reactions towards the total synthesis of natural products. We also highlight recent progress from our own laboratory regarding the synthesis of securinega alkaloids and humulanolides, which has resulted in the development of novel ruthenium-catalyzed metathesis cascade reactions. Inspired and guided by the pioneering and elegant research conducted in this area, we developed a regio-controlled relay dienyne metathesis cascade reaction and a cyclobutene-promoted RCM/ROM/RCM cascade reaction for the synthesis of securinega alkaloids and humulanolides, respectively...
October 24, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27775861/1-2-3-triazole-based-catalysts-from-metal-to-supramolecular-organic-catalysis
#6
Mercedes Zurro, Olga García Mancheño
1,2,3-Triazoles are unique heterocycles with intriguing physical properties that allow not only the coordination to metals, but also the establishment of supramolecular interactions based on their polarized C-H bonds. In this account, an extensive work of our group on the design and application of 1,2,3-triazole catalysts is covered. Initially, a family of BINOL triazoles (Click-BINOLs) was synthesized and employed in model test reactions in asymmetric metal catalysis such as the Ti-catalyzed addition of alkylzinc reagents to aldehydes...
October 24, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27775860/crystalline-highly-oriented-mof-thin-film-the-fabrication-and-application
#7
Zhihua Fu, Gang Xu
The thin film of metal-organic frameworks (MOFs) is a rapidly developing research area which has tremendous potential applications in many fields. One of the major challenges in this area is to fabricate MOF thin film with good crystallinity, high orientation and well-controlled thickness. In order to address this challenge, different appealing approaches have been studied intensively. Among various oriented MOF films, many efforts have also been devoted to developing novel properties and broad applications, such as in gas separator, thermoelectric, storage medium and photovoltaics...
October 24, 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
#8
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...
October 20, 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
#9
EDITORIAL
Takeshi Ohkuma
No abstract text is available yet for this article.
October 17, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27748019/transfer-hydrogenation-in-water
#10
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.
October 17, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27740733/imidazolium-based-probes-for-recognition-of-biologically-and-medically-relevant-anions
#11
Rahul Kumar, Sana Sandhu, Prabhpreet Singh, Subodh Kumar
The imidazolium derivatives due to their positive charge possess one of the most polarized and positively charged proton at C2-H to form strong ionic hydrogen bond (also termed as double ionic hydrogen bond) with anions and also provide opportunities for anion - π interactions with electron-deficient imidazolium ring. In the present review article, imidazolium based molecular probes for their ability to recognize inorganic anions like halides, cyanide, perchlorate, carboxylic acids, phosphate, sulfate etc...
October 14, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27734574/new-developments-in-chiral-cooperative-ion-pairing-organocatalysis-by-means-of-ammonium-oxyanions-and-fluorides-from-protonation-to-deprotonation-reactions
#12
Fabien Legros, Sylvain Oudeyer, Vincent Levacher
This personal account summarizes our contribution to the ion pairing organocatalysis mainly by use of chiral quaternary or tertiary ammonium fluorides, aryloxides and carboxylates. Starting from an experimental observation, we were able to develop several approaches for the enantioselective protonation of silyl enolates and enol esters giving rise to chiral carbonyl compounds bearing a stereogenic center at the α-position. Moving from protonation to deprotonation reactions, chiral ammonium ion pair catalysts were successfully applied to several asymmetric transformations such as an Henry reaction or a direct vinylogous aldol reaction to cite a few...
October 13, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27709788/micro-and-nano-liquid-phases-coexistent-with-ice-as-separation-and-reaction-media
#13
Tetsuo Okada
Ice has a variety of scientifically interesting features, some of which have not been reasonably interpreted despite substantial efforts by researchers. Most chemical studies of ice have focused on the elucidation of its physicochemical nature and its roles in the natural environment. Ice often contains impurities, such as salts, and in such cases, a liquid phase coexists with solid ice over a wide temperature range. This impure ice also acts as a cryoreactor, governing the circulation of chemical species of environmental importance...
October 6, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27709771/-2-1-cycloaddition-affording-methylene-and-vinylidenecyclopropane-derivatives-a-journey-around-the-reactivity-of-metal-phosphinito-phosphinous-acid-complexes
#14
Hervé Clavier, Gérard Buono
Metal-phosphinito-phosphinous acid complexes are interesting catalysts exhibiting unique reactivities. In this account, we intend to provide a clear overview of palladium- and platinum-phosphinito-phosphinous acid complexes, their preparation from secondary phosphine oxides, and their applications in catalysis. They have been mainly used to develop [2+1] cycloadditions to afford methylenecyclopropane derivatives using norbornenes and various alkynes as partners. As a function of the catalyst, the reaction conditions, or the nature of the reagents, different synthetic transformations have been observed: [2+1] cycloadditions, giving rise to either alkylidenecyclopropanes or vinylidenecyclopropanes; tandem [2+1]/[3+2] cycloadditions, and so forth...
October 6, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27701816/morita-baylis-hillman-mbh-reaction-derived-nitroallylic-alcohols-acetates-and-amines-as-synthons-in-organocatalysis-and-heterocycle-synthesis
#15
Wan-Yun Huang, Shaik Anwar, Kwunmin Chen
The Morita-Baylis-Hillman (MBH) reaction is one of the most useful and efficient protocols for constructing new carbon-carbon bonds between an activated olefin and electrophiles in the presence of a tertiary amine/phosphine. Herein, we present the use of MBH alcohols, which are obtained from the reaction of nitrostyrenes with aldehydes, as well as acetates and amines derived thereof in several organocatalytic transformations. Densely functionalised MBH adducts can also be used to synthesise substituted heteroaromatic compounds, such as furan, pyrrole, pyrazole and imidazole derivatives...
October 4, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27701807/lewis-base-catalyzed-stereo-and-regioselective-bromocyclization
#16
Matthew H Gieuw, Zhihai Ke, Ying-Yeung Yeung
Oxygen- and nitrogen-containing heterocyclic compounds are widely recognized as key components in many natural products and biologically relevant molecules, but often the problem comes down to methodologies in synthesizing them. Halocyclization of olefinic substrates is a promising strategy in the construction of O- and N-heterocyclic compounds, which further signifies the development of their asymmetric variants. Over the past years, our group has been devoted to this particular area of asymmetric electrophilic halocyclization with chalcogen-containing molecules as catalysts...
October 4, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27701806/photosensitizing-electron-transfer-processes-of-fullerenes-carbon-nanotubes-and-carbon-nanohorns
#17
Osamu Ito
In this account, studies on the photosensitizing electron transfer of nanocarbons, such as fullerenes, single-walled carbon nanotubes (SWCNTs), and carbon nanohorns (CNH), performed in our laboratory for about 15 years in the early 21st century have been briefly reviewed. These novel nanocarbons act as excellent electron acceptors, when they are linked to light-absorbing electron donors, such as porphyrins or phthalocyanines. For such molecule-nanocarbon hybrids, the direct confirmation of fast, transient, electron-transfer phenomena must be performed with time-resolved spectroscopic methods, such as transient absorption spectral measurements, in addition to fluorescence time-profile measurements in the wide-wavelength regions...
October 4, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27701805/recent-developments-in-coinage-metal-catalyzed-transformations-of-stabilized-vinyldiazo-compounds-beyond-carbenic-pathways
#18
Enol López, Silvia González-Pelayo, Luis A López
Transition metal-catalyzed transformations of vinyldiazo compounds have become a versatile tool in organic synthesis. Although several transition metals have been investigated for this purpose, this field has been mainly dominated by dirhodium catalysts. Remarkable levels of chemo-, regio-, diastereo- and enantioselectivity have been reached in some of these rhodium-catalyzed transformations. In the last few years coinage metals have also emerged as useful catalysts in transformations involving vinyldiazo compounds...
October 4, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27699973/transition-metal-catalyzed-asymmetric-hydrogenation-and-transfer-hydrogenation-sustainable-chemistry-to-access-bioactive-molecules
#19
Tahar Ayad, Phannarath Phansavath, Virginie Ratovelomanana-Vidal
Over the last few decades, the development of new and highly efficient synthetic methods to obtain chiral compounds has become an increasingly important and challenging research area in modern synthetic organic chemistry. In this account, we review recent work from our laboratory toward the synthesis of valuable chiral building blocks through transition-metal-catalyzed asymmetric hydrogenation and transfer hydrogenation of C=O, C=N and C=C bonds. Application to the synthesis of biologically relevant products is also described...
October 4, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27666585/chiral-bidentate-nhc-ligands-based-on-the-1-1-binaphthyl-scaffold-synthesis-and-application-in-transition-metal-catalyzed-asymmetric-reactions
#20
Qin Xu, Peng Gu, Hanchun Jiang, Yin Wei, Min Shi
The use of the chiral 1,1'-binaphthyl scaffold to construct chiral ligands can be traced back for a long time. However, the development of bidentate NHC ligands based on the same backbone has only appeared recently. In this account, we describe the design and synthesis of a new family of chiral NHC ligands based on the 1,1'-binaphthyl scaffold and demonstrate the applications of these chiral NHC-metal complexes in the catalyzed oxidative kinetic resolution of secondary alcohols, asymmetric carbon-carbon bond formations, hydrosilylations, and cyclizations of 1,6-enynes...
September 26, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
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