scholarly journals Recent Advances in Catalyzed Sequential Reactions and the Potential Use of Tetrapyrrolic Macrocycles as Catalysts

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2796 ◽  
Author(s):  
Everton Santos ◽  
Charles Carvalho ◽  
Carolina Terzi ◽  
Shirley Nakagaki
Keyword(s):  
Chemical Processes ◽  
One Pot ◽  
Solid Catalysts ◽  
Recent Advances ◽  
Multifunctional Catalysts ◽  
Ability To Act ◽  
Heterogeneous Processes ◽  
Potential Use ◽  
Sequential Reactions

Complexes of porphyrins and of other similar tetrapyrrolic macrocycles are extensively explored as catalysts for different chemical processes, and the development of solid catalysts for heterogeneous processes using molecules with the ability to act as multifunctional catalysts in one-pot reactions is increasing and can lead to the wider use of this class of molecules as catalysts. This mini review focuses on the application of this class of complexes as catalysts in a variety of sequential one-pot reactions.

scholarly journals Production of lactic acid from cellulose using solid catalyst

2019 ◽  
Vol 268 ◽  
pp. 07006 ◽  
Author(s):  
Sujitra Doungsri ◽  
P. Rattanaphanee ◽  
Aatichat Wongkoblap
Keyword(s):  
Lactic Acid ◽  
Batch Reactor ◽  
Nitrogen Pressure ◽  
Reaction Pathways ◽  
Solid Catalyst ◽  
One Pot ◽  
Solid Catalysts ◽  
Platform Chemicals ◽  
Acid And Base ◽  
The One

Lactic acid (LA), one of the important biomass derived platform chemicals, has been used in food and chemical industries, especially in biodegradable polymer as polylactic acid (PLA). The aim of this work is to study the one-pot production of LA from cellulose by using different solid catalysts. The reaction was conducted in a high pressure batch reactor and the catalyst used in this study were ZrO2 and Al2O3. The reaction was carried out at temperature of 200oC for 6 hr. and under nitrogen pressure of 1 MP. It was found that the production yield of LA were 8.02% and 6.63%, when the ZrO2 and Al2O3 catalysts were used respectively. The result indicated that the ZrO2 may effect on the LA production because of the acid and base sites of the ZrO2. Therefore, the reaction pathways for conversion of cellulose into lactic acid have been investigated, and developed the new conditions to achieve the higher yield.

Recent advances in cyclohydrocarbonylation reactions

2005 ◽  
Vol 83 (6-7) ◽  
pp. 681-692 ◽  
Author(s):  
Wen-Hua Chiou ◽  
Seung-Yub Lee ◽  
Iwao Ojima
Keyword(s):  
Transition Metal Complexes ◽  
Relevant Literature ◽  
Cascade Process ◽  
One Pot ◽  
Polycyclic Compounds ◽  
Carbon Nucleophiles ◽  
Recent Advances ◽  
Carbocyclic Compounds ◽  
Cascade Processes ◽  
One Step

This article describes recent advances in the cyclohydrocarbonylation reactions catalyzed by transition-metal complexes and their applications in organic synthesis as a review covering the relevant literature up to the middle of 2004. The reactions are categorized into four types, i.e., intramolecular amidocarbonylation reactions, intramolecular aminocarbonylation reactions, cyclohydrocarbonylation reactions involving carbon–nucleophiles, and other cyclohydrocarbonylation reactions. Cyclohydrocarbonylation reactions provide efficient routes to various monocyclic, bicyclic, and polycyclic compounds as a one-step cascade process or a one-pot process. Reaction mechanisms for these cascade processes are discussed as needed for clarification. The heterocyclic and carbocyclic compounds, thus obtained, can be further transformed to specific targets. Examples of such applications are also discussed.Key words: catalysis, cyclohydrocarbonylation, hydroformylation, amidocarbonylation, cyclization, regioselectivity, aldehydes, regioselective, cascade, heterocycles, rhodium.

One-Pot Synthesis of 3-(1,2,3,4-Tetrahydroisoquinolin-1-yl)-isoquinolin-1(2H)-ones by Sequential DEAD-Promoted Oxidative Ugi/Wittig Reaction Starting from Phosphonium Salt Precursors

Synlett ◽  
2021 ◽  
Author(s):  
Long Zhao ◽  
Mao-Lin Yang ◽  
Mei Sun ◽  
Ming-Wu Ding
Keyword(s):  
Wittig Reaction ◽  
Phosphonium Salt ◽  
One Pot ◽  
One Pot Synthesis ◽  
Sequential Reactions

A new one-pot Synthesis of 3-(1,2,3,4-tetrahydroisoquinolin-1-yl)- isoquinolin-1(2H)-ones by DEAD-promoted oxidative Ugi/Wittig reaction was developed. The sequential reactions of (2-carboxybenzyl)triphenylphosphonium salts, isocyanides and N-aryl-1,2,3,4-tetrahydroisoquinolines produced 3-(1,2,3,4-tetrahydroisoquinolin-1-yl)- isoquinolin-1(2H)-ones in moderate to good overall yields in the presence of DEAD and Et3N.

scholarly journals Recent Advances in Ultrafast Structural Techniques

2019 ◽  
Vol 9 (7) ◽  
pp. 1427 ◽  
Author(s):  
Germán Sciaini
Keyword(s):  
Structural Dynamics ◽  
Free Electron Laser ◽  
Review Article ◽  
Chemical Processes ◽  
Plasma Sources ◽  
X Ray ◽  
Recent Advances ◽  
Technological Developments ◽  
Computer Simulators ◽  
Electron Pulses

A review that summarizes the most recent technological developments in the field of ultrafast structural dynamics with focus on the use of ultrashort X-ray and electron pulses follows. Atomistic views of chemical processes and phase transformations have long been the exclusive domain of computer simulators. The advent of femtosecond (fs) hard X-ray and fs-electron diffraction techniques made it possible to bring such a level of scrutiny to the experimental area. The following review article provides a summary of the main ultrafast techniques that enabled the generation of atomically resolved movies utilizing ultrashort X-ray and electron pulses. Recent advances are discussed with emphasis on synchrotron-based methods, tabletop fs-X-ray plasma sources, ultrabright fs-electron diffractometers, and timing techniques developed to further improve the temporal resolution and fully exploit the use of intense and ultrashort X-ray free electron laser (XFEL) pulses.

scholarly journals Confinement Self-Assembly of Metal-Organic Cages within Mesoporous Carbon for One-Pot Sequential Reactions

Chem ◽  
2020 ◽  
Vol 6 (9) ◽  
pp. 2395-2406 ◽  
Author(s):  
Fan-Fan Zhu ◽  
Li-Jun Chen ◽  
Shangjun Chen ◽  
Gui-Yuan Wu ◽  
Wei-Ling Jiang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Mesoporous Carbon ◽  
One Pot ◽  
Metal Organic ◽  
Sequential Reactions

ChemInform Abstract: Recent Advances in InCl3-Catalyzed One-Pot Organic Synthesis.

ChemInform ◽  
2013 ◽  
Vol 44 (6) ◽  
pp. no-no
Author(s):  
Maya Shankar Singh ◽  
Keshav Raghuvanshi
Keyword(s):  
Organic Synthesis ◽  
One Pot ◽  
Recent Advances

Technical Capabilities of Concrete and its Structure Defects

2019 ◽  
Vol 974 ◽  
pp. 255-260
Author(s):  
Ludmila A. Suleymanova
Keyword(s):  
Building Materials ◽  
Materials Science ◽  
Structure Defects ◽  
Recent Advances ◽  
Physicochemical Basis ◽  
Strength And Durability ◽  
New Generation ◽  
Potential Use ◽  
Durability Of Concrete

Theoretical and experimental materials for analyzing the technical capabilities of concrete are generalized and the physicochemical basis for the strength and durability of concrete is developed on the basis of the recent advances in building materials science and other sciences. That may increase the traditional concrete potential use and most importantly – to create the most firm and durable concrete of the new generation.

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