Carbon-catalysed reductive hydrogen atom transfer reactions

Abstract

Generally, transition metal catalysts are essential for the reductive hydrogen atom transfer reaction, which is also known as the transfer hydrogenation reaction or the borrowinghydrogen reaction. It has been reported that graphene can be an active catalyst in ethylene and nitrobenzene reductions, but no report has described carbon-based materials as catalysts for alcohol amination via the borrowing-hydrogen reaction mechanism. Here we show the results from the preparation, characterization and catalytic performance investigation of carbon catalysts in transition metal-free borrowing-hydrogen reactions using alcohol amination and nitro compound/ketone reduction as model reactions. XPS, XRD, SEM, FT-IR and N 2 adsorption-desorption studies revealed that C ¼ O group in the carbon catalysts may be a possible catalytically active site, and high surface area is important for gaining high activity. The activity of the carbon catalyst remained unchanged after reuse. This study provides an attractive and useful methodology for a wider range of applications.

Using decalin and tetralin as hydrogen source for transfer hydrogenation of renewable lignin-derived phenolics over activated carbon supported Pd and Pt catalysts

“…Hydrogen released from H-donor compounds could be reacted with hydrogen acceptors on catalytic active sites. Catalytic reduction of a molecule using hydrogen atom transferred from donor molecule is called transfer hydrogenation [27][28][29][30] . Transfer hydrogenation occurs at less severe operating condition compared to hydrogenation using explosive hydrogen [31,32] .…”

Nitrogen, Phosphorus, and Sulfur Co‐Doped Hollow Carbon Shell as Superior Metal‐Free Catalyst for Selective Oxidation of Aromatic Alkanes

“…[3] Therefore,development of metal-free catalysts is quite desirable. [4] Recently,c arbon materials with or without dopant have shown promising abilities in many organic reactions as one kind of metal-free heterogeneous catalysts,i ncluding Friedel-Crafts alkylation reactions, [5] reductive hydrogen atom transfer reactions, [6] and oxidation of alcohols, [7] amines, [8] and arenes. [9] Tw or ecent outstanding studies demonstrated that it is also feasible to catalyze oxidation of C À Hb onds with carbocatalysts.W ang et al reported boron and fluorine co-doped mesoporous carbon nitride (B,F-doped C 3 N 4 )asametal-free catalyst for selective oxidation of cyclohexane to cyclohexanone with H 2 O 2 as oxidant.…”

Nitrogen, Sulfur Co‐doped Carbon Materials Derived from the Leaf, Stem and Root of Amaranth as Metal‐free Catalysts for Selective Oxidation of Aromatic Hydrocarbons

“…Especially, incorporating graphitic-type nitrogen in carbocatalysts is pivotal for the CÀ H bond activation. [22] All these characteristics together make SDC-A an excellent metalfree catalyst for the oxidation of aromatic hydrocarbons. In addition, the sulfur dopants also play a role in modulating electronic structure of the carbon atoms.…”