scholarly journals Improving the rates of Pd-catalyzed reactions by exciting the surface plasmons of AuPd bimetallic nanotriangles

RSC Advances ◽  
2017 ◽  
Vol 7 (64) ◽  
pp. 40218-40226 ◽  
Author(s):  
Mahesh K. Gangishetty ◽  
Adriana M. Fontes ◽  
Marcos Malta ◽  
Timothy L. Kelly ◽  
Robert W. J. Scott
Keyword(s):  
Surface Plasmons ◽  
Heating Mechanism ◽  
Hydrogenation Reactions ◽  
Plasmonic Heating ◽  
Catalyzed Reactions

Au@Pd nanotriangles are used to accelerate coupling and hydrogenation reactions by a plasmonic heating mechanism.

Microwave-Assisted Ruthenium-Catalyzed Reactions

2009 ◽  
Vol 62 (3) ◽  
pp. 184 ◽  
Author(s):  
François Nicks ◽  
Yannick Borguet ◽  
Sébastien Delfosse ◽  
Dario Bicchielli ◽  
Lionel Delaude ◽  
...  
Keyword(s):  
Reaction Times ◽  
Transfer Hydrogenation ◽  
Conventional Heating ◽  
Organic Chemical ◽  
Side Reactions ◽  
Chemical Transformations ◽  
Exchange Reactions ◽  
Present Contribution ◽  
Hydrogenation Reactions ◽  
Catalyzed Reactions

Since the first reports on the use of microwave irradiation to accelerate organic chemical transformations, a plethora of papers has been published in this field. In most examples, microwave heating has been shown to dramatically reduce reaction times, increase product yields, and enhance product purity by reducing unwanted side reactions compared with conventional heating methods. The present contribution aims at illustrating the advantages of this technology in homogeneous catalysis by ruthenium complexes and, when data are available, at comparing microwave-heated and conventionally heated experiments. Selected examples refer to olefin metathesis, isomerization reactions, 1,3-dipolar cycloadditions, atom transfer radical reactions, transfer hydrogenation reactions, and H/D exchange reactions.

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

Asymmetric homogeneous hydrogenation of olefins catalyzed by alkylphosphine complexes of rhodium(I)

1982 ◽  
Vol 60 (14) ◽  
pp. 1793-1799 ◽  
Author(s):  
William R. Cullen ◽  
J. Derek Woollins
Keyword(s):  
Itaconic Acid ◽  
Asymmetric Hydrogenation ◽  
Optically Active ◽  
Temperature Dependent ◽  
Homogeneous Hydrogenation ◽  
Nmr Spectrum ◽  
Tert Butyl ◽  
Hydrogenation Reactions ◽  
Catalyzed Reactions

The cationic rhodium(I) complexes of the optically active ferrocenes, C5H5FeC5H3[CH(CH3)N(CH3)2][ER2]-1,2, catalyze the asymmetric hydrogenation of acetamidoacrylic acid derivatives, itaconic acid and styrene, when ER2 is P(C6H5)2 or P(C(CH3)3)2. The configuration of the product is reversed on substituting C6H5 for C(CH3)3 groups. The catalyst with the tert-butyl groups can afford higher optical yields and is faster overall. The rhodium(I) complexes of the arsenic derivatives ER2 = As(C6H5)2 or As(CH3)2 do not catalyze the hydrogenation reactions. The nmr spectrum of the arsenic complex (ER2 = As(C6H5)2) is temperature dependent which seems to be due to a process involving the making and breaking of the Rh—N bond. The unsuccessful use of the MEM group (β-methoxyethoxymethyl) to protect an alcohol function α to a ferrocene ring is described. The hydrogenation results are discussed in the light of models which are currently used to predict the results of rhodium(I) catalyzed reactions but which are inapplicable to this work.

PHOTOEMISSION FROM THE DECAY OF SURFACE PLASMONS IN THIN FILMS OF Al

1973 ◽  
Vol 34 (C6) ◽  
pp. C6-95-C6-95
Author(s):  
T. A. CALLCOTT ◽  
E. T. ARAKAWA
Keyword(s):  
Thin Films ◽  
Surface Plasmons

THE OPTICS OF SURFACE PLASMONS

1984 ◽  
Vol 45 (C5) ◽  
pp. C5-233-C5-241 ◽  
Author(s):  
G. I. Stegeman ◽  
A. A. Maradudin ◽  
R. F. Wallis
Keyword(s):  
Surface Plasmons

A kinetic analysis of coupled sequential enzyme reactions

2018 ◽  
Author(s):  
Justin Eilertsen ◽  
Santiago Schnell
Keyword(s):  
Enzyme Assay ◽  
Sequential Reaction ◽  
Enzyme Reactions ◽  
Indicator Reaction ◽  
Single Substrate ◽  
Complex Sequences ◽  
Catalyzed Reactions ◽  
Enzyme Catalyzed Reactions ◽  
Single Enzyme

<div>As a case study, we consider a coupled enzyme assay of sequential enzyme reactions obeying the Michaelis--Menten reaction mechanism. The sequential reaction consists of a single-substrate, single-enzyme non-observable reaction followed by another single-substrate, single-enzyme observable reaction (indicator reaction). In this assay, the product of the non-observable reaction becomes the substrate of the indicator reaction. A mathematical analysis of the reaction kinetics is performed, and it is found that after an initial fast transient, the sequential reaction is described by a pair of interacting Michaelis--Menten equations. Timescales that approximate the respective lengths of the indicator and non-observable reactions, as well as conditions for the validity of the Michaelis--Menten equations are derived. The theory can be extended to deal with more complex sequences of enzyme catalyzed reactions.</div>

A kinetic analysis of coupled sequential enzyme reactions

2018 ◽  
Author(s):  
Justin Eilertsen ◽  
Santiago Schnell
Keyword(s):  
Enzyme Assay ◽  
Sequential Reaction ◽  
Enzyme Reactions ◽  
Indicator Reaction ◽  
Single Substrate ◽  
Complex Sequences ◽  
Catalyzed Reactions ◽  
Enzyme Catalyzed Reactions ◽  
Single Enzyme

<div>As a case study, we consider a coupled enzyme assay of sequential enzyme reactions obeying the Michaelis-Menten reaction mechanism. The sequential reaction consists of a single-substrate, single enzyme non-observable reaction followed by another single-substrate, single enzyme observable reaction (indicator reaction). In this assay, the product of the non-observable reaction becomes the substrate of the indicator reaction. A mathematical analysis of the reaction kinetics is performed, and it is found that after an initial fast transient, the sequential reaction is described by a pair of interacting Michaelis-Menten equations. Timescales that approximate the respective lengths of the indicator and non-observable reactions, as well as conditions for the validity of the Michaelis-Menten equations are derived. The theory can be extended to deal with more complex sequences of enzyme catalyzed reactions.</div>

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