Recent developments on methanol as liquid organic hydrogen carrier in transfer hydrogenation reactions

2021 ◽  
Vol 433 ◽  
pp. 213728
Author(s):  
Nidhi Garg ◽  
Ankita Sarkar ◽  
Basker Sundararaju
Keyword(s):  
Transfer Hydrogenation ◽  
Recent Developments ◽  
Hydrogenation Reactions ◽  
Hydrogen Carrier

Recent Developments of Manganese Complexes for Catalytic Hydrogenation and Dehydrogenation Reactions

Synthesis ◽  
2017 ◽  
Vol 49 (15) ◽  
pp. 3377-3393 ◽  
Author(s):  
Biplab Maji ◽  
Milan Barman
Keyword(s):  
Short Review ◽  
Transfer Hydrogenation ◽  
Manganese Complexes ◽  
Coupling Reactions ◽  
Primary Alcohols ◽  
Tridentate Ligands ◽  
Dehydrogenative Coupling ◽  
Recent Developments ◽  
Hydrogenation Reactions ◽  
Dehydrogenation Reactions

Being the third most abundant transition metal in the Earth’s crust (after iron and titanium) and less toxic, reactions catalyzed by manganese are becoming very important. A large number of manganese complexes have been synthesized using bidentate and tridentate ligands. Such manganese complexes display excellent catalytic activities for various important organic transformations, such as hydrogenation, dehydrogenation, dehydrogenative coupling, transfer hydrogenation reactions, etc. In this short review, recent developments of such manganese-catalyzed reactions are presented.1 Introduction2 Well-Defined Manganese-Complex-Catalyzed Hydrogenation Reactions2.1 Hydrogenation of Nitriles2.2 Hydrogenation of Aldehydes and Ketones2.3 Hydrogenation of Esters2.4 Hydrogenation of Amides2.5 Hydrogenation of Carbon Dioxide3 Manganese-Catalyzed Dehydrogenation Reactions3.1 Selective Dehydrogenation of Methanol3.2 Dehydrogenative N-Formylation of Amines by Methanol3.3 Dehydrogenative Coupling Reactions of Alcohols3.4 Imine Synthesis via Dehydrogenative Coupling of Alcohols and Amines3.5 Synthesis of N-Heterocycles via Dehydrogenative Coupling4 Manganese-Catalyzed Dehydrogenation–Hydrogenation Cascades4.1 N-Alkylation of Amines with Primary Alcohols4.2 α-Alkylation of Ketones with Primary Alcohols4.3 Transfer Hydrogenation of Ketones5 Conclusion

Catch It If You Can: Copper-Catalyzed (Transfer) Hydrogenation Reactions and Coupling Reactions by Intercepting Reactive Intermediates Thereof

Synthesis ◽  
2020 ◽  
Vol 52 (17) ◽  
pp. 2483-2496
Author(s):  
Johannes F. Teichert ◽  
Lea T. Brechmann
Keyword(s):  
Coupling Reaction ◽  
Reactive Intermediates ◽  
Transfer Hydrogenation ◽  
Coupling Reactions ◽  
Bond Forming ◽  
Starting Point ◽  
Bond Forming Reactions ◽  
Hydrogenation Reactions ◽  
Multicomponent Coupling Reactions ◽  
Trapping Reactions

The key reactive intermediate of copper(I)-catalyzed alkyne semihydrogenations is a vinylcopper(I) complex. This intermediate can be exploited as a starting point for a variety of trapping reactions. In this manner, an alkyne semihydrogenation can be turned into a dihydrogen­-mediated coupling reaction. Therefore, the development of copper-catalyzed (transfer) hydrogenation reactions is closely intertwined with the corresponding reductive trapping reactions. This short review highlights and conceptualizes the results in this area so far, with H2-mediated carbon–carbon and carbon–heteroatom bond-forming reactions emerging under both a transfer hydrogenation setting as well as with the direct use of H2. In all cases, highly selective catalysts are required that give rise to atom-economic multicomponent coupling reactions with rapidly rising molecular complexity. The coupling reactions are put into perspective by presenting the corresponding (transfer) hydrogenation processes first.1 Introduction: H2-Mediated C–C Bond-Forming Reactions2 Accessing Copper(I) Hydride Complexes as Key Reagents for Coupling Reactions; Requirements for Successful Trapping Reactions 3 Homogeneous Copper-Catalyzed Transfer Hydrogenations4 Trapping of Reactive Intermediates of Alkyne Transfer Semi­hydrogenation Reactions: First Steps Towards Hydrogenative Alkyne Functionalizations 5 Copper(I)-Catalyzed Alkyne Semihydrogenations6 Copper(I)-Catalyzed H2-Mediated Alkyne Functionalizations; Trapping of Reactive Intermediates from Catalytic Hydrogenations6.1 A Detour: Copper(I)-Catalyzed Allylic Reductions, Catalytic Generation of Hydride Nucleophiles from H2 6.2 Trapping with Allylic Electrophiles: A Copper(I)-Catalyzed Hydro­allylation Reaction of Alkynes 6.3 Trapping with Aryl Iodides7 Conclusion

ChemInform Abstract: NiO-Al2O3 Prepared from a Ni-Al Hydrotalcite Precursor as an Efficient Catalyst for Transfer Hydrogenation Reactions.

ChemInform ◽  
2010 ◽  
Vol 31 (33) ◽  
pp. no-no
Author(s):  
T. M. Jyothi ◽  
T. Raja ◽  
M. B. Talawar ◽  
K. Sreekumar ◽  
S. Sugunan ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Efficient Catalyst ◽  
Hydrogenation Reactions

scholarly journals Enantiomerically Enriched 1,2-P,N-Bidentate Ferrocenyl Ligands for 1,3-Dipolar Cycloaddition and Transfer Hydrogenation Reactions

Molecules ◽  
2018 ◽  
Vol 23 (6) ◽  
pp. 1311 ◽  
Author(s):  
Irina Utepova ◽  
Polina Serebrennikova ◽  
Marina Streltsova ◽  
Alexandra Musikhina ◽  
Tatiana Fedorchenko ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Dipolar Cycloaddition ◽  
Ferrocenyl Ligands ◽  
Hydrogenation Reactions

CO2-based hydrogen storage – Hydrogen generation from formaldehyde/water

2018 ◽  
Vol 3 (5) ◽  
Author(s):  
Monica Trincado ◽  
Hansjörg Grützmacher ◽  
Martin H. G. Prechtl
Keyword(s):  
Low Temperature ◽  
Hydrogen Generation ◽  
Hydrogen Fuel Cells ◽  
Oxidation Of Methanol ◽  
Global Demand ◽  
Recent Developments ◽  
Carrier Molecule ◽  
Hydrogen Carrier ◽  
Future Demands ◽  
Aqueous Formaldehyde

AbstractFormaldehyde (CH2O) is the simplest and most significant industrially produced aldehyde. The global demand is about 30 megatons annually. Industrially it is produced by oxidation of methanol under energy intensive conditions. More recently, new fields of application for the use of formaldehyde and its derivatives as, i.e. cross-linker for resins or disinfectant, have been suggested. Dialkoxymethane has been envisioned as a combustion fuel for conventional engines or aqueous formaldehyde and paraformaldehyde may act as a liquid organic hydrogen carrier molecule (LOHC) for hydrogen generation to be used for hydrogen fuel cells. For the realization of these processes, it requires less energy-intensive technologies for the synthesis of formaldehyde. This overview summarizes the recent developments in low-temperature reductive synthesis of formaldehyde and its derivatives and low-temperature formaldehyde reforming. These aspects are important for the future demands on modern societies’ energy management, in the form of a methanol and hydrogen economy, and the required formaldehyde feedstock for the manufacture of many formaldehyde-based daily products.

Facile assembly of bifunctional, magnetically retrievable mesoporous silica for enantioselective cascade reactions

2019 ◽  
Vol 55 (90) ◽  
pp. 13578-13581 ◽  
Author(s):  
Zhongrui Zhao ◽  
Fengwei Chang ◽  
Tao Wang ◽  
Lijian Wang ◽  
Lingbo Zhao ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Cross Coupling ◽  
Bifunctional Catalyst ◽  
Cascade Reactions ◽  
Transfer Hydrogenation ◽  
Asymmetric Transfer Hydrogenation ◽  
Aromatic Alcohols ◽  
Hydrogenation Reactions ◽  
Successive Reduction

A magnetically recyclable bifunctional catalyst enables synergistic Suzuki cross-coupling/asymmetric transfer hydrogenation and successive reduction/asymmetric transfer hydrogenation reactions for the preparation of chiral aromatic alcohols.

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.

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