Reductions With Nickel-Aluminum Alloy and Aqueous Alkall Part Ii. The Displacement of Groups by Hydrogen

Chemical reduction of an aqueous suspension of graphene oxide by nascent hydrogen

“…26 A common method to produce nascent hydrogen is the reaction of metals, such as Mg, Al, Fe or Zn with an acid, and amphoteric metals (Al and Zn) and their alloys (Devarda or RANEYÒ nickel) with alkali solution. [25][26][27][28] Although nascent hydrogen exists transiently, its lifetime is long enough to affect chemical reactions. [25][26][27][28] Being monoatomic, nascent hydrogen is a powerful reducing agent, which is widely used to reduce arsenic or nitrobenzene, 25 chalcopyrite, 26 carbonyl compounds 27,28 or to decolorize azo dyes.…”

“…[25][26][27][28] Although nascent hydrogen exists transiently, its lifetime is long enough to affect chemical reactions. [25][26][27][28] Being monoatomic, nascent hydrogen is a powerful reducing agent, which is widely used to reduce arsenic or nitrobenzene, 25 chalcopyrite, 26 carbonyl compounds 27,28 or to decolorize azo dyes. 29 Herein, we describe a new approach for the reduction of graphene oxide using nascent hydrogen in both acidic and alkaline media.…”

Selectivity issues in the catalytic multiphase reduction of functionalized halogenated aromatics over Pd/C, Pt/C, and Raney-Ni

“…It is well known that the aldehyde group and aromatic chlorine reduce easily with hydrogen over Pd or Ni catalysts in the liquid-phase systems [31][32][33][34]. Depending on the choice of catalyst or other conditions, the reduction of carbonyl can be carried out either towards alcohols or proceed to further hydrogenolysis of the C-O bond.…”

Quinolizidines. XXII. An extension of the "3-acetylpyridine route" to the syntheses of 9-hydroxy-10-methoxy- and 10-hydroxy-9-methoxybenzo[a]quinolizidine-type Alangium alkaloids.

“…The observed demethoxylation is rather unusual, but a few precedents have been found in the literature. 25 The structure of 36 was confirmed by an alternative synthesis, which furnished 36 from the known lactam 351926) in 94% yield by catalytic hydrogenolysis.…”