Aqueous phase semihydrogenation of alkynes over Ni–Fe bimetallic catalysts

Abstract

<p>Bimetallic Ni–Fe catalysts (Ni/Fe, 1 : 1, 1 : 3, and 3 : 1) are synthesized and explored for their catalytic activity in semihydrogenation of internal alkynes using H₂ gas in water–ethanol solution.</p>

Electrochemical Proton Reduction over Nickel Foam for Z‐Stereoselective Semihydrogenation/deuteration of Functionalized Alkynes

“…Raney nickel is a common example of a highly active base‐metal catalyst for reduction reactions; however, its pyrophoric nature is a significant limitation. [16] Other nickel complexes or nanoparticles have been reported to be good reduction catalysts, sometimes needing high hydrogen pressure and high temperature,[ 17 , 18 , 19 , 20 , 21 ] or an excess of the reductants, such as NaBH 4 or formic acid. [ 22 , 23 , 24 , 25 , 26 ] Hydrogen obtained from fossil resources can also be replaced by hydrogen produced electrochemically from water.…”

Simpler and Cleaner Synthesis of Variously Capped Cobalt Nanocrystals Applied in the Semihydrogenation of Alkynes

“…In the specific case of the semihydrogenation of alkynes, a wide range of transition metals have been studied especially palladium, gold, and platinum. , Huge efforts have been made for understanding the selectivity and mechanism of the reaction. However, their cost and sustainability required the use of cheaper transition metals . For Co, only one example has been published (by Beller’s group) using supported Co NPs as the catalyst .…”

Stereoselective Semi‐Hydrogenations of Alkynes by First‐Row (3d) Transition Metal Catalysts

“…The second example of a bimetallic nickel catalyst includes polyvinylpyrrolidone-stabilized nickel-iron nanoparticles that were prepared by reduction of NiCl 2 • 6 H 2 O and FeSO 4 • 7 H 2 O in aqueous solution using NaBH 4 . [100] Different Ni-to-Fe ratios have been prepared and investigated: While the pure iron catalyst Scheme 37. a) Substrate scope of the electrochemical Z-selective semihydrogenation of internal alkynes using a Ni foam cathode. [95] CC = carbon cloth.…”