5122-94-1Relevant articles and documents
Emission enhancement by formation of aggregates in hybrid chromophoric surfactant amphiphile/silica nanocomposites
Bhongale, Chetan Jagdish,Hsu, Chain-Shu
, p. 1404 - 1408 (2006)
(Figure Presented) In best order: Nanoaggregates of chromophores formed in a controlled fashion in self-assembled functional hybrid nanocomposites enhance fluorescence (see scheme). These hybrids minimize the problem of solid-state quenching and are thus applicable in the fabrication of electroluminescence devices.
Novel κ2-Nim,S- and κ4-C,Nim,(μ-S),(μ-S)-coordination of di-2-thienyl ketone thiosemicarbazone (dtktsc). Hydrogen evolution and catalytic properties of palladacyclic [Pd(κ4-C,Nim,(μ-S),(μ-S)-dtktsc-2H)]4
Bakir, Mohammed,Bohari Yamin, M.,Lawrence, Mark W.
, (2020)
The reaction between di-2-thienyl ketone thiosemicarbazone, dtktsc, (1) and Zn(OAc)2·2H2O in ethanol produced [Zn(κ2-Nim,S-dtktsc-H)2] (2). When PdCl2(CH3CN)2 was used in place Zn(OAc)2·2H2O novel [Pd(κ4-C,Nim,(μ-S),(μ-S)-dtktsc-2H)]4 (3) was isolated. These reactions are in contrast with those reported for the synthesis of [Zn(κ3-Npy,Nim,S-dpktsc-H)2] and [PdCl(κ3-Npy,Nim,S),PdCl2(κ2-Npy,Nam)-dpktsc-H)] ? CH3CN when di-2-pyridyl ketone thiosemicarbazone (dpktsc) was used in place of 1. The identities of 2 and 3 were established from results of their elemental compositions, spectroscopic and electrochemical properties. The κ2-Nim,S-coordination of the imide deprotonated dtktsc (dtktsc-H)– to the Zn(II) ion was established from 13C and 1H NMR measurements. X-ray structural analysis on a single crystal of 3 ? dmf confirmed the κ4-Nim,C,(μ-S),(μ-S)-coordination of amide deprotonated and thienyl metallated dtktsc (dtktsc-2H)2- to the Pd(II) ion. In acidic or basic media 2 suffers dissociation, while 3 is stable under similar conditions. Electrochemical measurements on dmf solutions of 2 and 3, along with electrochemical reactions of dtktsc with Zn(OAc)2·2H2O and PdCl2(CH3CN)2 revealed facile coordination of dtktsc to the metal ions. The palladacyclic 3 shows good electro-catalytic behavior toward proton reduction and moderate catalytic activity toward C[sbnd]C cross-coupling reactions.
Nitrogen-containing compound, electronic element, and electronic device
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Paragraph 0157-0159, (2021/01/29)
The invention provides a nitrogen-containing compound shown as a chemical formula 1, an electronic element and an electronic device, and belongs to the technical field of organic materials. The structural formula of the nitrogen-containing compound is shown as a chemical formula 1, wherein Ar1 and Ar2 are selected from substituted or unsubstituted aryl with the carbon atom number of 6-30, substituted or unsubstituted heteroaryl with the carbon atom number of 3-30 and substituted or unsubstituted naphthenic base with the carbon atom number of 3-20; Ar3 is selected from substituted or unsubstituted aryl with the carbon atom number of 6-20 and substituted or unsubstituted heteroaryl with the carbon atom number of 3-20.
Asymmetric 1,4-Addition of Arylboronic Acids to β,γ-Unsaturated α-Ketoesters using Heterogeneous Chiral Metal Nanoparticle Systems
Miyamura, Hiroyuki,Yasukawa, Tomohiro,Zhu, Zhiyuan,Kobayashi, Shū
supporting information, p. 353 - 359 (2019/12/15)
Asymmetric 1,4-addition reactions with β,γ-unsaturated α-ketoesters are valuable because the resulting chiral ketoester compounds can be converted into various useful species that are often used as chiral building blocks in drug and natural product synthesis. However, β,γ-unsaturated α-ketoesters have two reactive points in terms of nucleophilic additions, which will lead to the 1,4-adduct, the 1,2-adduct and to the combined 1,4- and 1,2-adduct. Therefore, controlling this chemoselectivity is an important factor for the development of these transformations. Here, we developed an asymmetric 1,4-addition of aryl boronic acids to β,γ-unsaturated α-ketoesters by using heterogeneous chiral rhodium nanoparticle systems with a chiral diene ligand bearing a secondary amide moiety. The newly developed polydimethylsilane-immobilized rhodium nanoparticle catalysts showed high activity, high chemoselectivity, and excellent enantioselectivity, and this is the first heterogeneous catalytic system for this asymmetric reaction. Metal nanoparticle catalysts were recovered and reused without loss of activity or leaching of metal. (Figure presented.).
Transition-Metal-Free Borylation of Aryl Bromide Using a Simple Diboron Source
Han, Min Su,Lim, Taeho,Ryoo, Jeong Yup
, p. 10966 - 10972 (2020/09/23)
In this study, we developed a simple transition-metal-free borylation reaction of aryl bromides. Bis-boronic acid (BBA), was used, and the borylation reaction was performed using a simple procedure at a mild temperature. Under mild conditions, aryl bromides were converted to arylboronic acids directly without any deprotection steps and purified by conversion to trifluoroborate salts. The functional group tolerance was considerably high. The mechanism study suggested that this borylation reaction proceeds via a radical pathway.
Magnesium promoted autocatalytic dehydrogenation of amine borane complexes: A reliable, non-cryogenic, scalable access to boronic acids
Marciasini, Ludovic D.,Richard, Jimmy,Cacciuttolo, Bastien,Sartori, Guillaume,Birepinte, Melodie,Chabaud, Laurent,Pinet, Sandra,Pucheault, Mathieu
, p. 164 - 171 (2018/12/05)
Owing to the unusual reactivity of dialkylamine-borane complexes, a methodology was developed to simply access boronic acids. The intrinsic instability of magnesium aminoborohydride was tweaked into a tandem dehydrogenation borylation sequence. Proceeding via an autocatalytic cycle, amineborane dehydrogenation was induced by a variety of Grignard reagents. Overall, addition of the organomagnesium species onto specially designed dialkylamine-borane complexes led to a variety of boronic acids in high yields. In addition, the reaction can be performed under Barbier conditions, on a large scale.
Copper-Catalyzed Monoorganylation of Trialkyl Borates with Functionalized Organozinc Pivalates
Fu, Ying,Gou, Bei-Lei,Shi, Chun-Zhao,Du, Zhengyin,Shen, Tong
, p. 4253 - 4257 (2018/09/18)
Organozinc pivalates, a recently developed air- and moisture-stable organozinc species, were found for the first time as excellent organometallic species in the monoorganylation of trialkyl borates whereby boronic acids were prepared in high yields. The significant advantage of organozinc pivalates over another previously employed organometallic reagents, e. g., organolithium reagents, Grignard reagents and organozinc halides, is that the generation of multiorganylation byproducts such as borinic acids and trialkylboranes were completely suppressed. Additionally, the in situ generated boronates could be directly arranged into Suzuki-Miyaura type cross-coupling reactions to produce biaryls in high yields.
BLUE FLUORESCENT DOPANT MATERIALS, AND ORGANIC THIN FILM AND ORGANIC LIGHT EMITTING DEVICES COMPRISING THE SAME
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, (2017/06/23)
The present invention refers to one or more layers including a light emitting layer between anode and cathode is interposed as above wherein at least one of an organic electroluminescent device, comprising of a luminescent layer for organic thin film layer contains said formula 1, formula 2 characterized in that said hole transport material to the light emitting layer employed in conjunction with an organic electroluminescence device number under public affairs substrate. The organic electroluminescence device of the present invention exhibits high efficiency and long lifetime properties. [Formula 1][Formula 2] (by machine translation)
Spectroscopic Studies of the Chan-Lam Amination: A Mechanism-Inspired Solution to Boronic Ester Reactivity
Vantourout, Julien C.,Miras, Haralampos N.,Isidro-Llobet, Albert,Sproules, Stephen,Watson, Allan J. B.
supporting information, p. 4769 - 4779 (2017/04/11)
We report an investigation of the Chan-Lam amination reaction. A combination of spectroscopy, computational modeling, and crystallography has identified the structures of key intermediates and allowed a complete mechanistic description to be presented, including off-cycle inhibitory processes, the source of amine and organoboron reactivity issues, and the origin of competing oxidation/protodeboronation side reactions. Identification of key mechanistic events has allowed the development of a simple solution to these issues: manipulating Cu(I) → Cu(II) oxidation and exploiting three synergistic roles of boric acid has allowed the development of a general catalytic Chan-Lam amination, overcoming long-standing and unsolved amine and organoboron limitations of this valuable transformation.
Construction of Vesicles, Micro/Nanorods and Ultralong Nanotubes through the Self-Assembly of Non-Classical Amphiphiles with Rigid Conformation
Lin, Feng,Liang, Rongran,Qi, Qiaoyan,Zhan, Tianguang,Li, Zhanting,Zhao, Xin
, p. 429 - 434 (2017/04/27)
Amphiphilic molecules have long been regarded as an important class of supramolecular building blocks for the fabrication of nanomaterials. While most previous researches have mainly focused on amphiphlies with flexible structures, in this work, four novel amphiphiles possessing wholly-rigid skeletons have been designed and synthesized. These molecules were built by using 4,4’-bipyridin-1-ium or viologen as hydrophilic moieties and phenyl or biphenyl as hydrophobic segments, bridged by a pyridazine unit. Their self-assembly behavior has been investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM), which revealed they could self-assemble into well-ordered nanoarchitectures with various morphologies such as vesicles, micro/nanorods and nanotubes in water or methanol, depending on their hydrophilic/hydrophobic fraction ratios.
