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

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

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.

Catalytic transfer hydrogenation reactions of PEG-bound succinyl esters

2005 ◽  
Vol 46 (20) ◽  
pp. 3591-3593 ◽  
Author(s):  
H.M. Sampath Kumar ◽  
Pawan Chakravarthy ◽  
Sanghapal D. Sawant ◽  
Parvinder Pal Singh ◽  
M. Shesha Rao ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
Hydrogenation Reactions ◽  
Catalytic Transfer

scholarly journals A facile and highly efficient transfer hydrogenation of ketones and aldehydes catalyzed by palladium nanoparticles supported on mesoporous graphitic carbon nitride

2019 ◽  
Vol 44 (1-2) ◽  
pp. 14-19
Author(s):  
Bilal Nişancı ◽  
Ziya Dağalan
Keyword(s):  
Carbon Nitride ◽  
Glass Tube ◽  
Pd Nanoparticles ◽  
Graphitic Carbon ◽  
Transfer Hydrogenation ◽  
Graphitic Carbon Nitride ◽  
Reusable Catalyst ◽  
Hydrogenation Reactions ◽  
High Yields ◽  
Benzaldehyde Derivatives

A novel transfer hydrogenation methodology for the reduction of ketones (14 examples) and benzaldehyde derivatives (12 examples) to the corresponding alcohols using Pd nanoparticles supported on mesoporous graphitic carbon nitride (mpg-C3N4/Pd) as a reusable catalyst and ammonia borane as a safe hydrogen source in an aqueous solution MeOH/H2O (v/v = 1/1) is described. The catalytic hydrogenation reactions were conducted in a commercially available high-pressure glass tube at room temperature, and the corresponding alcohols were obtained in high yields in 2–5 min. Moreover, the presented transfer hydrogenation protocol shows partial halogen selectivity with bromo-, fluoro-, and chloro-substituted carbonyl analogs. In addition, the present catalyst can be reused up to five times without losing its efficiency, and scaling-up the reaction enables α-methylbenzyl alcohol to be produced in 90% isolated yield.

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