scholarly journals Electrocatalytic hydrogenation of guaiacol in diverse electrolytes using a slurry reactor

2019 ◽  
Author(s):  
Yanuar Philip Wijaya
Keyword(s):  
Reduction Process ◽  
Slurry Reactor ◽  
Catalyst Loading ◽  
Electrocatalytic Reduction ◽  
Electrocatalytic Hydrogenation ◽  
Perchloric Acid Solution ◽  
Faradaic Efficiency ◽  
Mild Conditions ◽  
Constant Potential ◽  
Low Catalyst Loading

Electrocatalytic hydrogenation-hydrogenolysis (ECH) of guaiacol was performed in an H-cell type of slurry reactor configuration with Pt/C catalyst. Different pairs of electrolytes, in catholyte-anolyte combinations, were investigated by constant potential chronocoulometry, showing that the acidic anolyte is preferable for an effective ECH. The advantages of this slurry reactor are mainly attributed to the enhanced Faradaic efficiency and recoverability of the catalyst. High guaiacol conversion (>90%) can be achieved at mild conditions (307 K, 1 atm) in perchloric acid solution (0.5 M), resulting in 54% cyclohexanol selectivity at moderate Faradaic efficiency (53%) and low catalyst loading. This work opens up the possibility of renewable synthesis of valuable chemicals from biomass-derived substrates via electrocatalytic reduction process at mild conditions.

H/D exchange in N-heterocycles catalysed by an NHC-supported ruthenium complex

2019 ◽  
Vol 9 (13) ◽  
pp. 3398-3407 ◽  
Author(s):  
V. Hung Mai ◽  
Oleg B. Gadzhiev ◽  
Stanislav K. Ignatov ◽  
Georgii I. Nikonov
Keyword(s):  
Catalytic Activity ◽  
Ruthenium Complex ◽  
Catalyst Loading ◽  
Mild Conditions ◽  
Low Catalyst Loading

NHC-supported trihydrides Cp(NHC)RuH3show excellent catalytic activity in the H/D exchange of pyridine and some other N-heterocycles under mild conditions and low catalyst loading.

Selective 1,4-Arylsulfonation of 1,3-Enynes via Photoredox/Nickel Dual Catalysis

2022 ◽  
Author(s):  
Chao Li ◽  
Duo-Duo Hu ◽  
Ruoxing Jin ◽  
Bing-Bing Wu ◽  
Cheng-Yu Wang ◽  
...  
Keyword(s):  
Catalyst Loading ◽  
Mild Conditions ◽  
Radical Cascade ◽  
Dual Catalysis ◽  
Low Catalyst Loading

A photoredox/nickel-catalyzed selective 1,4-arylsulfonation of 1,3-enynes to access structurally diverse sulfone-containing allenes has been established. This radical cascade transformation featured with easy manipulation, mild conditions, low catalyst loading, broad substrate...

Visible-Light-Induced Aerobic Oxidation of Benzylic C(sp3)–H of Alkylarenes Promoted by DDQ, tert-Butyl Nitrite, and Acetic Acid

Synlett ◽  
2018 ◽  
Vol 30 (02) ◽  
pp. 218-224 ◽  
Author(s):  
Zhenlu Shen ◽  
Decheng Pan ◽  
Yiqing Wang ◽  
Meichao Li ◽  
Xinquan Hu ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Visible Light ◽  
Aerobic Oxidation ◽  
Catalyst Loading ◽  
Thermal Methods ◽  
Oxidation Method ◽  
Tert Butyl ◽  
Mild Conditions ◽  
Low Catalyst Loading ◽  
Visible Light Photocatalytic

A visible-light photocatalytic aerobic oxidation of benzylic C(sp3)–H bonds proceeded in the presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, tert-butyl nitrite, and acetic acid. Advantages of this aerobic oxidation method include its relatively mild conditions, the use of visible-light irradiation instead of conventional thermal methods, the use of a low catalyst loading, and the ability to oxidize a range of alkyl­arenes, including xanthenes, thioxanthenes, and 9,10-dihydroacridines, to the corresponding ketones in excellent yields.

Bismuth(iii) triflate-catalysed tandem cyclisations towards complex polycyclic ethers

2016 ◽  
Vol 3 (8) ◽  
pp. 999-1003 ◽  
Author(s):  
Pierrick Ondet ◽  
Luisa Lempenauer ◽  
Elisabet Duñach ◽  
Gilles Lemière
Keyword(s):  
Catalyst Loading ◽  
Mild Conditions ◽  
Low Catalyst Loading ◽  
Polycyclic Ethers

A series of complex polycyclic ethers have been synthesised under very mild conditions using a low catalyst loading of bismuth(iii) triflate.

Lipase catalyzed 1,2-addition of thiols to imines under mild conditions

2018 ◽  
Vol 42 (3) ◽  
pp. 1642-1645 ◽  
Author(s):  
Tábata B. Albuquerque ◽  
Caren D. G. da Silva ◽  
Aline R. de Oliveira ◽  
Beatriz F. dos Santos ◽  
Beatriz A. L. da Silva ◽  
...  
Keyword(s):  
Catalyst Loading ◽  
Mild Conditions ◽  
High Yields ◽  
Low Catalyst Loading

PPL, chymosin and BSA as efficient biocatalysts (low catalyst loading, high yields) in an eco-friendly synthesis of N,S-acetals.

scholarly journals Highly efficient ethylene production via electrocatalytic hydrogenation of acetylene under mild conditions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Suheng Wang ◽  
Kelechi Uwakwe ◽  
Liang Yu ◽  
Jinyu Ye ◽  
Yuezhou Zhu ◽  
...  
Keyword(s):  
Ethylene Production ◽  
High Efficiency ◽  
Ambient Pressure ◽  
Industrial Process ◽  
Electrocatalytic Hydrogenation ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Cu Catalyst

AbstractRenewable energy-based electrocatalytic hydrogenation of acetylene to ethylene (E-HAE) under mild conditions is an attractive substitution to the conventional energy-intensive industrial process, but is challenging due to its low Faradaic efficiency caused by competitive hydrogen evolution reaction. Herein, we report a highly efficient and selective E-HAE process at room temperature and ambient pressure over the Cu catalyst. A high Faradaic efficiency of 83.2% for ethylene with a current density of 29 mA cm−2 is reached at −0.6 V vs. the reversible hydrogen electrode. In-situ spectroscopic characterizations combined with first-principles calculations reveal that electron transfer from the Cu surface to adsorbed acetylene induces preferential adsorption and hydrogenation of the acetylene over hydrogen formation, thus enabling a highly selective E-HAE process through the electron-coupled proton transfer mechanism. This work presents a feasible route for high-efficiency ethylene production from E-HAE.

scholarly journals Enantioselective cyanation via radical-mediated C–C single bond cleavage for synthesis of chiral dinitriles

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Tao Wang ◽  
Yi-Ning Wang ◽  
Rui Wang ◽  
Bo-Chao Zhang ◽  
Chi Yang ◽  
...  
Keyword(s):  
Ring Opening ◽  
Bond Cleavage ◽  
Catalyst Loading ◽  
Small Ring ◽  
Single Bond ◽  
Asymmetric Transformations ◽  
Mild Conditions ◽  
Ring Opening Reaction ◽  
High Yields ◽  
Low Catalyst Loading

AbstractRing-opening reaction via selective cleavage of C–C bond is known as a powerful strategy for construction of complex molecules. Complementary to the ionic process focusing on mostly small ring systems, radical-mediated C–C bond cleavage offers a solution for further diverse enantioselective functionalization benefited from its mild conditions, whereas such asymmetric transformations are still limited to three-membered rings so far. Herein, we describe radical-mediated ring-opening and enantioselective cyanation of four- and five-membered cycloketone oxime esters to access chiral 1,5- and 1,6-dinitriles. Employment of dual photoredox/copper catalysis is essential for the asymmetric ring-opening cyanation of cyclopentanone oxime esters. Both reactions proceed under mild conditions giving chiral dinitriles in high yields and enantioselectivity with low catalyst loading and broad substrate scope. The products dinitriles can be converted to valuable optically active diamides and diamines. Mechanistic studies indicate that the benzylic radical generated via C–C single bond cleavage is involved in the catalytic cycle.

Y(OTf)3-catalyzed Phosphorylation of 2H-Chromene Hemiacetals with P(O)-H compounds to 2-Phosphorylated 2H-Chromenes

2021 ◽  
Author(s):  
Long Chen ◽  
Shi-Lu Zheng ◽  
Yun-Xiang Zou ◽  
Zhong Wen ◽  
Jiafu Lin ◽  
...  
Keyword(s):  
Catalyst Loading ◽  
Facile Synthesis ◽  
Reaction Conditions ◽  
Low Catalyst Loading

Facile synthesis of 2-phosphorylated 2H-chromenes has been accomplished herein via a Y(OTf)3-catalyzed dehydrative coupling of 2H-chromene hemiacetals with P(O)-H compounds. This protocol features low catalyst loading, mild reaction conditions, broad...

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