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

<div>An extract of <i>Aloe Vera</i> acts as a powerful reducing agent for the synthesis of ultrasmall copper nanoparticles (CuNPs) in water medium. The prepared copper nanoparticles are characterized by XRD, HRTEM and UV-Vis analysis. The diameter of the prepared nanoparticle is less than 5 nm. The catalytic activity of CuNPs has been successfully evaluated for the three-component reaction to synthesize 1,2,3-triazoles and chalcone tethered 1,2,3-triazoles with low catalyst loading and under mild reaction conditions. These triazoles are further utilized for the synthesis of dihydropyrazines.</div>

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

Organic Chemistry Frontiers ◽

10.1039/d1qo01653a ◽

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...

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

Synlett ◽

10.1055/s-0037-1610678 ◽

2018 ◽

Vol 30 (02) ◽

pp. 218-224 ◽

Cited By ~ 3

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.

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Synthesis and Catalytic Applications of Ultrasmall Copper Nanoparticles Using Aloe Vera Plant Extract

10.26434/chemrxiv.13187780.v1 ◽

2020 ◽

Author(s):

Rajagopal Ramkumar ◽

Shradha Sapru ◽

Panthalattu Parambil Archana

Keyword(s):

Catalytic Activity ◽

Copper Nanoparticles ◽

Plant Extract ◽

Aloe Vera ◽

Catalyst Loading ◽

Water Medium ◽

Reaction Conditions ◽

Three Component Reaction ◽

Catalytic Applications ◽

Low Catalyst Loading

<div>An extract of <i>Aloe Vera</i> acts as a powerful reducing agent for the synthesis of ultrasmall copper nanoparticles (CuNPs) in water medium. The prepared copper nanoparticles are characterized by XRD, HRTEM and UV-Vis analysis. The diameter of the prepared nanoparticle is less than 5 nm. The catalytic activity of CuNPs has been successfully evaluated for the three-component reaction to synthesize 1,2,3-triazoles and chalcone tethered 1,2,3-triazoles with low catalyst loading and under mild reaction conditions. These triazoles are further utilized for the synthesis of dihydropyrazines.</div>

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Electrocatalytic hydrogenation of guaiacol in diverse electrolytes using a slurry reactor

10.1149/osf.io/36kg2 ◽

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.

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Manganese-Catalyzed Asymmetric Hydrogenation of Quinolines Enabled by pi–pi Interaction

10.26434/chemrxiv.13034363 ◽

2020 ◽

Author(s):

Chenguang Liu ◽

Mingyang Wang ◽

Shihan Liu ◽

Yujie Wang ◽

Yong Peng ◽

...

Keyword(s):

Catalytic Activity ◽

Noble Metal ◽

Asymmetric Hydrogenation ◽

Catalyst Loading ◽

Turnover Number ◽

Noble Metal Catalysts ◽

Wide Range ◽

Metal Catalyzed ◽

High Yields ◽

Low Catalyst Loading

<p>The first example of non-noble metal-catalyzed asymmetric hydrogenation of aromatic <i>N</i>-heterocycles is reported. A new chiral pincer manganese catalyst showed outstanding catalytic activity in the asymmetric hydrogenation of a wide range of quinolines, affording high yields and excellent enantioselectivities (up to 97% <i>ee</i>). A turnover number of 3840 was reached at a low catalyst loading (S/C=4000), which was competitive with the activity of most effective noble metal catalysts for this reaction. The precise regulation of the enantioselectivity were ensured by a p–p interaction.<u></u></p>

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Starch assisted palladium(0) nanoparticles as in situ generated catalysts for room temperature Suzuki–Miyaura reactions in water

RSC Advances ◽

10.1039/c5ra22349k ◽

2016 ◽

Vol 6 (14) ◽

pp. 11758-11762 ◽

Cited By ~ 25

Author(s):

Anindita Dewan ◽

Pankaj Bharali ◽

Utpal Bora ◽

Ashim Jyoti Thakur

Keyword(s):

Catalytic Activity ◽

Room Temperature ◽

Coupling Reaction ◽

Cross Coupling ◽

Catalyst Loading ◽

Arylboronic Acids ◽

Cross Coupling Reaction ◽

Low Catalyst Loading

The in situ generated PdNPs show excellent catalytic activity in Suzuki–Miyaura cross coupling reaction of electronically diversified arylbromides and arylboronic acids in water at room temperature with low catalyst loading.

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