Reduction of citral in water under typical transfer hydrogenation conditions—Reaction mechanisms with evolution of and hydrogenation by molecular hydrogen

The Golden Age of Transfer Hydrogenation

“…The reports on the catalytic applications of activated carbon-supported ruthenium, palladium, and iridium complex or nanoparticle composites in TH were frequently found. In particular, these easily fabricated, even commercially available, materials were extensively used in the synthesis of fine chemicals, fuels, and functional compounds, such as methyl furan, , dimethyl furan, , monoenes, hexitols, citronellal, aromatic heterocycle-containing amines, quinazolin-4­( 3H )-one and benzimidazoles, and halogenated anilines …”

Effective parameters on selective catalytic hydrodeoxygenation of phenolic compounds of pyrolysis bio-oil to high-value hydrocarbons

“…Heterogeneous catalysts of Pd/C, Pd/Al 2 O 3 , Pd-La/ Al 2 O 3 , Ru/C, RANEY® Ni and Ni-Cu/Al 2 O 3 were used in transfer hydrogenation of phenols, aldehydes, ketones and biooil. 153,155,[177][178][179] It is generally supposed that both the reactions of hydrogen liberation from H-donor and hydrogen consumption by acceptor are simultaneously occurred on the same catalytic active sites. Therefore, an efficient catalyst for transfer hydrogenation reaction should have high potential for adsorption of both hydrogen donor and acceptor molecules.…”

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

“…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] . The exact mechanism of transfer hydrogenation reaction depends on type of H-donor and catalyst [32][33][34] .…”

“…Transfer hydrogenation occurs at less severe operating condition compared to hydrogenation using explosive hydrogen [31,32] . The exact mechanism of transfer hydrogenation reaction depends on type of H-donor and catalyst [32][33][34] . An efficient catalyst for transfer hydrogenation reaction should have high potential for adsorption of both hydrogen donor and acceptor molecules [19] .…”