Schischkiniin support studies: synthetic access to 1,1′-bisindoles

Wang, Christy; Sperry, Jonathan

doi:10.1039/c2cc37241j

Cited by 25 publications

(21 citation statements)

References 30 publications

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“…TXM analysis has utilized the beamline 01B1 facility of the National Synchrotron Radiation Research Center (NSRRC) in Taiwan, and results from a detailed study of the SnO electrode analyzed during the first two lithiation-delithiation cycles have been published . Within the past few years, the importance of high-resolution in situ X-ray microscopy for studying high-capacity secondary batteries has become apparent Chao et al, 2010;Wang, Chen-Wiegart et al, 2013). In situ TXM research in combination with XANES on battery materials was carried out to achieve the necessary characterization of the phase and chemical states as well as the morphology evolution at nanometer resolution .…”

Section: Transmission X-ray Microscopymentioning

confidence: 99%

“…Additionally, TXM is the synchrotronbased full-field imaging method that acquires a complete image on a direct imaging base with the highest resolution and is the best suited for morphological studies on dynamic events and microtomography (Kaulich et al, 2009). It can also perform two-dimensional imaging on several materials such as fuel cells and battery electrodes and has received increasing interest for applications in different fields of study (Li et al, 2016;Singh et al, 2012;Wang, Chen-Wiegart et al, 2013).…”

Section: Introduction To In Situ Synchrotron Techniquesmentioning

confidence: 99%

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In situelectrochemical synchrotron radiation for Li-ion batteries

Alemu

Wang

2018

J Synchrotron Radiat

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Observing the electronic structure, compositional change and morphological evolution of the surface and interface of a battery during operation provides essential information for developing new electrode materials for Li-ion batteries (LIBs); this is because such observations demonstrate the fundamental reactions occurring inside the electrode materials. Moreover, obtaining detailed data on chemical phase changes and distributions by analyzing an operating LIB is the most effective method for exploring the intercalation/de-intercalation process, kinetics and the relationship between phase change or phase distribution and battery performance, as well as for further optimizing the material synthesis routes for advanced battery materials. However, most conventional in situ electrochemical techniques (other than by using synchrotron radiation) cannot clearly or precisely demonstrate structural change, electron valence change and chemical mapping information. In situ electrochemical-synchrotron radiation techniques such as X-ray absorption spectroscopy, X-ray diffraction spectroscopy and transmission X-ray microscopy can deliver accurate information regarding LIBs. This paper reviews studies regarding various applications of in situ electrochemical-synchrotron radiation such as crystallographic transformation, oxidation-state changes, characterization of the solid electrolyte interphase and Li-dendrite growth mechanism during the intercalation/de-intercalation process. The paper also presents the findings of previous review articles and the future direction of these methods.

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Section: Transmission X-ray Microscopymentioning

confidence: 99%

Section: Introduction To In Situ Synchrotron Techniquesmentioning

confidence: 99%

In situelectrochemical synchrotron radiation for Li-ion batteries

Alemu

Wang

2018

J Synchrotron Radiat

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“…As seen from the work of Nishida, the conjugated double bond (vinylogous carbamate) can isomerize as necessary to set up the Heck cyclization (equation 5) [15]. A Mori-Ban indole synthesis has featured prominently in the syntheses of (±)-aspidophytine [16], stephacidin A [17], 1,1′-bisindoles [18], a potent EP 3 receptor antagonist (DG-041) [19], kinesin spindle protein inhibitors [20], hepatitis C protein inhibitors [21], and S1P 1 agonists [22].…”

Section: The Mori-ban Indole Synthesis Is a Pd-catalyzed Cyclization mentioning

confidence: 99%

Palladium‐Catalyzed Indole Ring Synthesis

Gribble

2016

Indole Ring Synthesis

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“…9,10 This new methodology relied on several diallylated hydrazobenzenes undergoing two simultaneous Mori-Ban cyclizations to construct both heterocycles in a single step with minimal N-N bond cleavage. J. Sperry Developing a general synthetic approach to 1,1′-bisindoles (Scheme 1).…”

Section: Synform What Is Your Most Important Scientific Achievement Tmentioning

confidence: 99%

Synform Issue 2015/02

Zanda¹

2015

Synlett

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C o n TA C T Yo ur op ini on ab ou t Sy nf or m is we lco me , ple as e co rre sp on d if yo u lik e: ma rk et ing @t hie me -c he mi str y.c omThis document was downloaded for personal use only. Unauthorized distribution is strictly prohibited. Dear readers,Although this Editorial will be published in the February issue of Synform, the truth is that I am writing it soon after the Christmas and New Year celebrations, which I have spent in Italy. Like most of you, I have eaten and drunk way too much and I suspect I have put on quite some weight as a consequence of the many lunches and dinners with relatives and friends. Now I am facing a period whereby I will necessarily have to keep my gastronomic exuberance under control, which doesn't make me too happy… Let's try to put aside food and drinks for a while then, and focus on something else, if possible. Let's concentrate on good chemistry, such as that described in this new issue of Synform. We start with a novel fluorination procedure discovered by D. Carbon-fluorine bond construction has consistently been of great interest to chemists due to the unique characteristics of fluorinated molecules and the synthetic challenges connected with the introduction of fluorine into organic molecules. Apart from the ipso-fluorination of pre-functionalized substrates, C -H bond fluorination is a prospective alternative and has received a great deal of attention in recent years. However, several challenges, for example, relatively harsh conditions, excess amounts of fluorinating agents (oxidants), narrow substrate scopes and poor selectivity still need to be addressed for this emerging area. Given the broad application of fluorinated compounds in pharmaceuticals, agrochemicals and materials, a mild and versatile C-H bond fluorination protocol is highly desirable. Very recently, a novel and facile nitrate-promoted regioselective fluorination of aromatic and olefinic sp 2 -C -H bonds under mild conditions was described by Professors Dan-Qian Xu and Zhen-Yuan Xu, and Dr. Shao-Jie Lou from Zhejiang University of Technology (P. R. of China).Generally, the fluorination reactions took place under very mild conditions (close to room temperature in most cases). strength of both C-H and C-F bonds, so we were delighted to find that the current palladium-nitrate catalytic system enabled the process in a much milder manner." "A catalytic amount of simple, non-toxic and cheap potassium nitrate served as a highly efficient promoter," said Professor D.-Q. Xu. "Actually, silver nitrate was found to be an efficient additive for this transformation at the outset of this program," she explained. Since silver salts were demonstrated to be incorporated in several C-F bond formation reactions, various silver salts were then screened. However, only silver nitrate and silver nitrite could successfully promote the reaction, whereas other silver salts were ineffective. Professor Z.-Y. Xu said: "The unique counter-anion effect led us to hypo thesize that the nitrate anion might be the pivotal promoter. ...

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Schischkiniin support studies: synthetic access to 1,1′-bisindoles

Abstract: The first general synthetic approach to 1,1'-bisindoles is described. Two simultaneous, ambient temperature Mori-Ban reactions were used to effect bisindolization of several diallylated hydrazobenzenes with minimal cleavage of the N-N bond.

Cited by 25 publications

References 30 publications

In situelectrochemical synchrotron radiation for Li-ion batteries

In situelectrochemical synchrotron radiation for Li-ion batteries

Palladium‐Catalyzed Indole Ring Synthesis

Synform Issue 2015/02

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