Cobalt-catalyzed alkylation of methyl-substituted N-heteroarenes with primary alcohols: direct access to functionalized N-heteroaromatics

2020 ◽  
Vol 56 (2) ◽  
pp. 249-252 ◽  
Author(s):  
Anju Mishra ◽  
Ambikesh D. Dwivedi ◽  
Sujan Shee ◽  
Sabuj Kundu

Cobalt-catalyzed alkylation of various methyl-substituted N-heteroarenes with alcohols is reported for the first time.

2018 ◽  
Vol 54 (87) ◽  
pp. 12369-12372 ◽  
Author(s):  
Mari Vellakkaran ◽  
Jagadish Das ◽  
Sourajit Bera ◽  
Debasis Banerjee
Keyword(s):  

Base-metal catalysed C(sp3)–H bond functionalisation of methyl-N-heteroaromatics with alcohols is reported for the first time.


2019 ◽  
Vol 21 (18) ◽  
pp. 7514-7518 ◽  
Author(s):  
Jagadish Das ◽  
Mari Vellakkaran ◽  
Motahar Sk ◽  
Debasis Banerjee

2013 ◽  
Vol 721 ◽  
pp. 438-453 ◽  
Author(s):  
Oleg Andreev ◽  
Yurii Kolesnikov ◽  
André Thess

AbstractWhen a liquid metal flows around a truncated cylinder in the presence of a magnetic field which is parallel to the axis of the cylinder, a stagnant region develops above the cylinder. We call this region a Ludford column. The Ludford column represents the magnetohydrodynamics (MHD) analogue of the well-known Taylor columns in rotating flows. Whereas Taylor columns can be easily visualized using dye, the visualization of Ludford columns has remained elusive up to now because liquid metals are opaque. We demonstrate that this fundamental limitation of experimental MHD can be overcome by using a superconducting 5 T magnet. This facility permits us to perform MHD experiments in which the opaque liquid metals are replaced with a transparent electrolyte while maintaining the key MHD effects. We report results of a series of flow experiments in which an aqueous solution of sulphuric acid flows around a bar with square cross-section (which for simplicity shall be referred to as a cylinder). We vary the Reynolds number in the range $5\lt Re\lt 100$ and the Hartmann number in the range $0\lt Ha\lt 14$. The experimental procedure involves flow visualizations using tracer particles as well as velocity measurements using particle image velocimetry (PIV). Our experiments provide direct access to the Ludford column for the first time and reveal the spatial structure of this basic feature of MHD flows.


2017 ◽  
Vol 53 (96) ◽  
pp. 12902-12905 ◽  
Author(s):  
Jin-Quan Chen ◽  
Le-Le Song ◽  
Feng-Xing Li ◽  
Zi-Fa Shi ◽  
Xiao-Ping Cao

The asymmetric synthesis of Szántay's amine (+)-2, the pivotal precursor for direct access to (+)-cycloclavine (1), is described for the first time in eleven steps with 19.7% overall yield from the commercially available 4-bromoindole.


2021 ◽  
Vol 25 ◽  
Author(s):  
Hélène Pellissier

: This review collects for the first time enantioselective one-pot processes promoted by green chiral zinc catalysts. It illustrates how much these cheap, non-toxic and environmentally benign catalysts allow unprecedented asymmetric domino and tandem reactions of many types to be achieved, allowing a direct access to a wide variety of very complex chiral molecules.


2020 ◽  
Vol 56 (82) ◽  
pp. 12443-12446
Author(s):  
Xianjin Zhu ◽  
Can Liu ◽  
Yong Liu ◽  
Haijun Yang ◽  
Hua Fu

A sodium trifluoromethanesulfinate-mediated photocatalytic strategy for the aerobic oxidation of secondary and primary alcohols to ketones and carboxylic acids has been developed for the first time.


2015 ◽  
Vol 51 (27) ◽  
pp. 5925-5928 ◽  
Author(s):  
Ren-Jin Tang ◽  
Qing He ◽  
Luo Yang

A metal-free oxidative decarbonylative coupling of aromatic aldehydes with electron-rich or electron-deficient arenes to produce biaryl compounds was developed for the first time.


2020 ◽  
Vol 56 (90) ◽  
pp. 14083-14086
Author(s):  
Peng Yang ◽  
Xiuhua Wang ◽  
Yu Ma ◽  
Yaxin Sun ◽  
Li Zhang ◽  
...  

A simple catalyst of Ni(OAc)2/P(t-Bu)3 enables selective C-alkylation of thioacetamides and primary acetamides with alcohols for the first time.


Comunicar ◽  
2010 ◽  
Vol 17 (34) ◽  
pp. 55-63 ◽  
Author(s):  
Michael Bull

For the first time in industrialised culture, over fifty percent of the population possesses the ability to privatise whatever environment they might be in through the use of a dedicated MP3 player or through a mobile phone with MP3 capabilities. The consumption of technologically mediated sound in the 20th and 21st centuries represents an increasingly significant mode of ‘being-in-theworld’ in which the ‘self’ claims a mobile and auditory territory for itself through a specific form of ‘sensory gating’ permitting the user to screen out unwanted sounds through the creation of their own seductive soundscape. The untrammelled pleasures of creating a privatised mobile soundworld resonates through urban and cultural theory posing a set of interrelated theoretical problems relating to both our relation to the spaces we move through. the nature and meaning of public and private space., the potential for urban aestheticisation, urban retreat and withdrawalIn this paper I discuss the use of Apple iPod in terms of its use as a technological support system of users. The paper draws upon the Internet responses of over one thousand iPod users worldwide between 2004 and 2005. The paper investigates the specific nature of auditory mediation that use entails. It argues that iPod use can usefully be interpreted as a form of pleasurable toxicity within which the ‘total mediated’ world of users lies a dream of unmediated experience - of direct access to the world and one’s emotions. Por primera vez desde el nacimiento de la cultura industrializada, más de la mitad de la población es capaz de personalizar cualquier parte de su entorno gracias a un reproductor de MP3 o a través de un teléfono móvil. El consumo de sonidos mediados tecnológicamente durante los siglos XX y XXI representa una forma cada vez más importante de «estar-en-el-mundo»; el «yo» reclama un territorio sonoro móvil a través de una especie de «compuerta sensorial» que le permite filtrar los sonidos que no le interesan y crear el paisaje sonoro que más le satisface. El placer sin límites que supone crear un mundo sonoro móvil de carácter privado plantea, para la teoría urbana y cultural, un conjunto de problemas teóricos que tienen que ver con la relación con los espacios en los que nos movemos, la naturaleza y el significado del espacio público y privado, el potencial de la estetización de lo urbano, y la incomunicación de la ciudad. También cuestiona el conocimiento de las tecnologías que se usan para mediatizar gran parte de la experiencia cotidiana. En este artículo se analiza el uso del iPod como soporte tecnológico para los consumidores. Se basa en las respuestas de más de un millar de usuarios entre 2004-05. Plantea que el uso del iPod puede ser interpretado positivamente si se considera como una forma de toxicidad placentera en la que bajo el mundo «totalmente mediatizado» de los usuarios subyace un anhelo de experiencia no mediatizada –de acceso directo al mundo y a las emociones de cada uno.


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