scholarly journals A Triflamide-Tethered N-Heterocyclic Carbene-Rhodium(I) Catalyst for Hydroalkoxylation Reactions: Ligand-Promoted Nucleophilic Activation of Alcohols

ChemCatChem ◽  
2017 ◽  
Vol 9 (8) ◽  
pp. 1397-1401 ◽  
Author(s):  
Abir Sarbajna ◽  
Pragati Pandey ◽  
S. M. Wahidur Rahaman ◽  
Kuldeep Singh ◽  
Akshi Tyagi ◽  
...  
Keyword(s):  
Activation Of Alcohols

Designed pincer ligands supported Co(II)-based catalysts for dehydrogenative activation of alcohols: Studies on N-alkylation of amines, -alkylation of ketones and synthesis of quinolines

2021 ◽  
Author(s):  
Anshu Singh ◽  
Ankur Maji ◽  
Mayank Joshi ◽  
Angshuman Roychoudhury ◽  
Kaushik Ghosh
Keyword(s):  
Base Metal ◽  
Metal Catalysts ◽  
Pincer Ligands ◽  
Activation Of Alcohols

Base-metal catalysts Co1, Co2 and Co3 were synthesized from designed pincer ligands L1, L2 and L3 having NNN donor atoms respectively. Co1, Co2 and Co3 were characterized by IR, UV–Vis....

Pyridine mediated transition-metal-free direct alkylation of anilines using alcohols via borrowing hydrogen conditions

2020 ◽  
Vol 56 (88) ◽  
pp. 13607-13610 ◽  
Author(s):  
Rajagopal Pothikumar ◽  
Venugopal T Bhat ◽  
Kayambu Namitharan
Keyword(s):  
Transition Metal ◽  
Traditional Approach ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Metal Free ◽  
Borrowing Hydrogen ◽  
Activation Of Alcohols ◽  
Catalyst Systems ◽  
Hydrogen Reactions

Herein, we report aza-aromatics based organic mediators as a readily accessible alternative to the traditional approach of using transition metal catalyst systems for the activation of alcohols in borrowing hydrogen reactions.

H2-Generation from Alcohols by the MOF-Based Noble Metal-Free Photocatalyst Ni/CdS/TiO2@MIL-101

2019 ◽  
Vol 72 (10) ◽  
pp. 842 ◽  
Author(s):  
Dominic Tilgner ◽  
Mara Klarner ◽  
Sebastian Hammon ◽  
Martin Friedrich ◽  
Andreas Verch ◽  
...  
Keyword(s):  
Noble Metal ◽  
Metal Organic Framework ◽  
Multiple Bond ◽  
Bond Formation ◽  
Metal Free ◽  
Fossil Carbon ◽  
Gas Atmosphere ◽  
Metal Organic ◽  
Hydrogen Liberation ◽  
Activation Of Alcohols

The synthesis of important classes of chemical compounds from alcohols helps to conserve Earth’s fossil carbon resources, since alcohols can be obtained from indigestible and abundantly available biomass. The utilisation of visible light for the activation of alcohols permits alcohol-based C–N and C–C bond formation under mild conditions inaccessible with thermally operating hydrogen liberation catalysts. Herein, we report on a noble metal-free photocatalyst able to split alcohols into hydrogen and carbonyl compounds under inert gas atmosphere without the requirement of electron donors, additives, or aqueous reaction media. The reusable photocatalyst mediates C–N multiple bond formation using the oxidation of alcohols and subsequent coupling with amines. The photocatalyst consists of a CdS/TiO2 heterojunction decorated with co-catalytic Ni nanoparticles and is prepared on size-optimised colloidal metal–organic framework (MOF) crystallites.

Highly efficient iron phthalocyanine catalyzed oxidative synthesis of imines from alcohols and amines

2013 ◽  
Vol 91 (8) ◽  
pp. 732-737 ◽  
Author(s):  
Manju Bala ◽  
Praveen Kumar Verma ◽  
Neeraj Kumar ◽  
Upendra Sharma ◽  
Bikram Singh
Keyword(s):  
Lewis Acid ◽  
Oxidative Coupling ◽  
Aliphatic Alcohols ◽  
Nucleophilic Attack ◽  
Iron Phthalocyanine ◽  
Acid Base ◽  
Base Interaction ◽  
Highly Efficient ◽  
Activation Of Alcohols ◽  
Acid Base Interaction

An efficient iron phthalocyanine catalyzed method was developed for direct oxidative coupling of alcohols with amines to afford corresponding imines. The present protocol is applicable to various substituted aromatic and aliphatic alcohols and amines. The reaction is believed to proceed via activation of alcohols by iron phthalocyanines through Lewis acid–base interaction to form aldehydes, which by nucleophilic attack of amines are converted into the corresponding imines.

Borrowing Hydrogen in the Activation of Alcohols

2007 ◽  
Vol 349 (10) ◽  
pp. 1555-1575 ◽  
Author(s):  
Malai Haniti S. A. Hamid ◽  
Paul A. Slatford ◽  
Jonathan M. J. Williams
Keyword(s):  
Borrowing Hydrogen ◽  
Activation Of Alcohols

Gold(III)/Sodium Diphenylphosphinobenzene-3-sulfonate (TPPMS) Catalyzed Dehydrative N-Benzylation of Electron-Deficient Anilines in Water

Synthesis ◽  
2019 ◽  
Vol 51 (13) ◽  
pp. 2729-2736 ◽  
Author(s):  
Hidemasa Hikawa ◽  
Mika Matsumoto ◽  
Sayoko Tawara ◽  
Shoko Kikkawa ◽  
Isao Azumaya
Keyword(s):  
Lewis Acid ◽  
Acid Catalysis ◽  
Bond Cleavage ◽  
Solvent Isotope Effect ◽  
Mild Conditions ◽  
Simple Protocol ◽  
Economic Process ◽  
Cleavage Step ◽  
Activation Of Alcohols ◽  
Solvent Isotope

A strategy for the dehydrative N-benzylation of electron-deficient anilines in water has been developed. The gold(III)/sodium diphenylphosphinobenzene-3-sulfonate (TPPMS) catalyst is highly effective as a Lewis acid for the activation of alcohols and tolerates aerobic conditions. A Hammett study in the reaction of para-substituted benzhydryl alcohols shows negative σ values, indicating a build-up of cationic charge during the rate-determining sp3 C–O bond-cleavage step. The inverse kinetic solvent isotope effect (KSIE = 0.6) is consistent with a specific acid catalysis mechanism. This simple protocol can be performed under mild conditions in an atom-economic process without the need for base or other additives, furnishing the electron-deficient N-benzylic anilines in moderate to excellent yields along with water as a sole coproduct.

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