Identification of Intermediates in Zeolite‐Catalyzed Reactions by In Situ UV/Vis Microspectroscopy and a Complementary Set of Molecular Simulations

2013 ◽  
Vol 19 (49) ◽  
pp. 16595-16606 ◽  
Author(s):  
Karen Hemelsoet ◽  
Qingyun Qian ◽  
Thierry De Meyer ◽  
Kristof De Wispelaere ◽  
Bart De Sterck ◽  
...  
Keyword(s):  
Molecular Simulations ◽  
Complementary Set ◽  
Catalyzed Reactions

Synthesis of Bifunctional Au/Pt/Au Core/Shell Nanoraspberries for in Situ SERS Monitoring of Platinum-Catalyzed Reactions

2011 ◽  
Vol 133 (48) ◽  
pp. 19302-19305 ◽  
Author(s):  
Wei Xie ◽  
Christoph Herrmann ◽  
Karsten Kömpe ◽  
Markus Haase ◽  
Sebastian Schlücker
Keyword(s):  
Core Shell ◽  
Catalyzed Reactions

Rhodium(iii)-catalyzed indole synthesis at room temperature using the transient oxidizing directing group strategy

2019 ◽  
Vol 55 (64) ◽  
pp. 9547-9550 ◽  
Author(s):  
Yaping Shang ◽  
Krishna Jonnada ◽  
Subhash Laxman Yedage ◽  
Hua Tu ◽  
Xiaofeng Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Nitroso Group ◽  
Group Strategy ◽  
Internal Alkynes ◽  
Directing Group ◽  
Catalyzed Reactions ◽  
Indole Synthesis

Rh-Catalyzed reactions of N-alkyl anilines with internal alkynes at room temperature have been developed using an in situ generated N-nitroso group as a transient oxidizing directing group.

Enantioselective Catalytic Methods for the Elaboration of Chiral Tetrahydro-β-carbolines and Related Scaffolds

Synthesis ◽  
2017 ◽  
Vol 49 (12) ◽  
pp. 2605-2620 ◽  
Author(s):  
Nicolas Glinsky-Olivier ◽  
Xavier Guinchard
Keyword(s):  
Kinetic Resolution ◽  
Asymmetric Reduction ◽  
Asymmetric Hydrogenation ◽  
Transfer Hydrogenation ◽  
Chiral Molecules ◽  
Chiral Phosphoric Acid ◽  
Hydrogenation Reactions ◽  
Synthetic Intermediates ◽  
Catalyzed Reactions

Tetrahydro-β-carbolines are important synthetic intermediates in the total synthesis of natural products and of compounds exhibiting strong bioactivities. Over the last decades, catalytic methods using chiral catalysts have been described for their synthesis. This review covers catalytic and enantioselective methods to access chiral tetrahydro-β-carbolines and their applications in the elaboration of complex chiral molecules.1 Introduction2 Asymmetric Reduction of Dihydro-β-carbolines2.1 Asymmetric Transfer Hydrogenation Reactions2.2 Asymmetric Hydrogenation Reactions2.3 Biocatalyzed Reduction of Dihydro-β-carbolines3 Organocatalyzed Pictet–Spengler Reactions3.1 Chiral Thiourea-Catalyzed Reactions3.2 Chiral Phosphoric Acid Catalyzed Reactions4 Pictet–Spengler Reactions of In Situ Generated Cyclic Iminiums5 Organocatalyzed Functionalization of Dihydro-β-carboliniums6 Organocatalyzed Alkylation of Tetrahydro-β-carbolines7 Biocatalyzed Dynamic Kinetic Resolution of Tetrahydro-β-carbolines8 Conclusion and Perspectives

Design and Application of a New Reactor for in Situ Infrared Spectroscopic Investigations of Heterogeneously Catalyzed Reactions

1994 ◽  
Vol 48 (2) ◽  
pp. 194-197 ◽  
Author(s):  
Gabriele Mirth ◽  
Florian Eder ◽  
Johannes A. Lercher
Keyword(s):  
Heating Rates ◽  
Time Resolved ◽  
Ft Ir ◽  
Temperature Programmed ◽  
Kinetic Investigations ◽  
Catalyzed Reactions ◽  
Gas Chromatography Mass Spectroscopy ◽  
Transparent Windows ◽  
Desorption Reaction

A design of a metal reactor equipped with gas in- and outlet tubings and IR transparent windows is described. The IR cell approximates a wellstirred tank reactor and is suited for in situ kinetic investigations of catalytic reactions. While the catalyst, in contact with the reactants and products, is analyzed in situ by means of time-resolved FT-IR spectroscopy, the effluent gas stream is analyzed by gas chromatography mass spectroscopy. The reactor operates at temperatures up to 870 K; for applications of temperature-programmed desorption/reaction, linear heating rates between 1 and 20 K/min can be realized. Examples for applications are given.

scholarly journals Probing Electric Double-Layer Composition via in Situ Vibrational Spectroscopy and Molecular Simulations

2019 ◽  
Vol 10 (12) ◽  
pp. 3381-3389 ◽  
Author(s):  
Jonathan H. Raberg ◽  
Jenel Vatamanu ◽  
Stephen J. Harris ◽  
Christina H. M. van Oversteeg ◽  
Axel Ramos ◽  
...  
Keyword(s):  
Vibrational Spectroscopy ◽  
Double Layer ◽  
Electric Double Layer ◽  
Molecular Simulations ◽  
Layer Composition

scholarly journals Nanocatalyst shape and composition during nucleation of single-walled carbon nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (129) ◽  
pp. 106377-106386 ◽  
Author(s):  
Jose L. Gomez-Ballesteros ◽  
Juan C. Burgos ◽  
Pin Ann Lin ◽  
Renu Sharma ◽  
Perla B. Balbuena
Keyword(s):  
Carbon Nanotubes ◽  
High Resolution ◽  
Molecular Simulations ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
High Resolution Microscopy

Molecular simulations and in situ high resolution microscopy reveal the existence of a carbon gradient inside the nanocatalyst during nanotube nucleation.

Alkylation Reactions with Alkylsulfonium Salts

Synthesis ◽  
2021 ◽  
Author(s):  
Ze-Yu Tian ◽  
Yu Ma ◽  
Cheng-Pan Zhang
Keyword(s):  
Organic Molecules ◽  
High Efficiency ◽  
Building Blocks ◽  
Organometallic Reagents ◽  
The Past ◽  
Wide Range ◽  
Catalyzed Reactions ◽  
Metal Catalyzed ◽  
Alkylation Reactions

Application of alkylsulfonium salts as alkyl transfer reagents in organic synthesis has reemerged over the past years. Numerous heteroatom- and carbon-centered nucleophiles, alkenes, arenes, alkynes, organometallic reagents, and others were readily alkylated by alkylsulfonium salts under mild conditions. The reactions feature convenience, high efficiency, readily accessible and structurally diversified alkylation reagents, good functional group tolerance, and a wide range of substrate types, allowing for facile synthesis of various useful organic molecules from the commercially available building blocks. This review summarizes the alkylation reactions using either isolated or in situ formed alkylsulfonium salts via nucleophilic substitution, transition-metal-catalyzed reactions, and photoredox processes.

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