Cluster-based MOFs with accelerated chemical conversion of CO2 through C–C bond formation

2017 ◽  
Vol 53 (44) ◽  
pp. 6013-6016 ◽  
Author(s):  
Gang Xiong ◽  
Bing Yu ◽  
Jie Dong ◽  
Ying Shi ◽  
Bin Zhao ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Bond Formation ◽  
Chemical Conversion ◽  
Terminal Alkynes ◽  
Mild Conditions ◽  
First Time

We report here two cluster-based MOFs I and II as excellent heterogeneous catalysts in the carboxylation reactions of CO2 and terminal alkynes under 1 atm and mild conditions. This is the first time for MOFs materials to catalyze this type of reactions.

Ni-catalyzed direct iminoalkynylation of unactivated olefins with terminal alkynes: facile access to alkyne-labelled pyrrolines

2021 ◽  
Author(s):  
Xingjie Zhang ◽  
Di Qi ◽  
Chenchen Jiao ◽  
Zhiguo Zhang ◽  
Xiaopan Liu ◽  
...  
Keyword(s):  
Radical Cyclization ◽  
Terminal Alkynes ◽  
Mild Conditions ◽  
Type Coupling ◽  
First Time

The direct iminoalkynylation of unactivated olefins with terminal alkynes is achieved for the first time by nickel-catalyzed cascade iminyl-radical cyclization/Sonogashira-type coupling of γ,δ-unsaturated oxime esters under mild conditions. This transformation...

Neodymium-Promoted Highly Selective Carbon–Carbon Double Bond Formation of Ketones with Allyl Halides in the Presence of Diethyl Phosphite

Synthesis ◽  
2020 ◽  
Vol 52 (22) ◽  
pp. 3446-3451
Author(s):  
Songlin Zhang ◽  
Dengbing Xie ◽  
Yiqiong Wang ◽  
Bo Yang
Keyword(s):  
Double Bond ◽  
Bond Formation ◽  
Point Of View ◽  
Diethyl Phosphite ◽  
Reaction Conditions ◽  
One Pot ◽  
Mild Conditions ◽  
Carbon Double Bond ◽  
Allyl Halides ◽  
First Time

The carbon–carbon double bond formation via neodymium-mediated Barbier-type reaction of ketones and allyl halides in the presence of diethyl phosphite is reported for the first time. The reaction is highly α-regioselective and was conveniently carried out under mild conditions in a one-pot fashion. From a synthetic point of view, a series of conjugated alkenes were obtained in moderate to good yields in this one-pot reaction with feasible reaction conditions.

N-Heterocyclic carbene copper-catalyzed direct alkylation of terminal alkynes with non-activated alkyl triflates

2017 ◽  
Vol 53 (29) ◽  
pp. 4124-4127 ◽  
Author(s):  
Liqun Jin ◽  
Wangfang Hao ◽  
Jianeng Xu ◽  
Nan Sun ◽  
Baoxiang Hu ◽  
...  
Keyword(s):  
Bond Formation ◽  
Terminal Alkynes ◽  
Mild Conditions

(NHC)-Cu-catalyzed C(sp)–C(sp3) bond formation has been successfully achieved under mild conditions.

scholarly journals C–C Bond formation catalyzed by natural gelatin and collagen proteins

2013 ◽  
Vol 9 ◽  
pp. 1111-1118 ◽  
Author(s):  
Dennis Kühbeck ◽  
Basab Bijayi Dhar ◽  
Eva-Maria Schön ◽  
Carlos Cativiela ◽  
Vicente Gotor-Fernández ◽  
...  
Keyword(s):  
Bond Formation ◽  
Scale Up ◽  
Product Yield ◽  
Order Rate Constant ◽  
Physiological Conditions ◽  
First Order ◽  
Bond Forming ◽  
Mild Conditions ◽  
Nitroaldol Reaction ◽  
First Time

The activity of gelatin and collagen proteins towards C–C bond formation via Henry (nitroaldol) reaction between aldehydes and nitroalkanes is demonstrated for the first time. Among other variables, protein source, physical state and chemical modification influence product yield and kinetics, affording the nitroaldol products in both aqueous and organic media under mild conditions. Significantly, the scale-up of the process between 4-nitrobenzaldehyde and nitromethane is successfully achieved at 1 g scale and in good yield. A comparative kinetic study with other biocatalysts shows an increase of the first-order rate constant in the order chitosan < gelatin < bovine serum albumin (BSA) < collagen. The results of this study indicate that simple edible gelatin can promote C–C bond forming reactions under physiological conditions, which may have important implications from a metabolic perspective.

Cu(II)-CMC: a mild, efficient and recyclable catalyst for the oxidative alkyne homocoupling reaction

2017 ◽  
Vol 72 (8) ◽  
pp. 549-554
Author(s):  
Yuqin Jiang ◽  
Niu Guo ◽  
Xiyong Li ◽  
Yamin Sun ◽  
Weiwei Zhang
Keyword(s):  
Catalytic Activity ◽  
Carboxymethyl Cellulose ◽  
Recyclable Catalyst ◽  
Sodium Carboxymethyl Cellulose ◽  
Terminal Alkynes ◽  
Mild Conditions ◽  
Efficient Route ◽  
Homocoupling Reaction ◽  
First Time

AbstractCu(II) heterogenized on sodium carboxymethyl cellulose (Na-CMC) has been thoroughly characterized by different techniques. Cu(II)-CMC has been applied for the first time in the homocoupling reaction of a variety of terminal alkynes. The catalyst furnished good to excellent yields of the desired products and could be reused six times without loss of catalytic activity. The Cu(II)-CMC catalysis protocol is a new efficient route to synthesize 1,3-diynes under mild conditions.

Iron-catalyzed cross coupling of P–H/C–O bonds: efficient synthesis of α-alkoxyphosphorus compounds

2016 ◽  
Vol 45 (5) ◽  
pp. 1877-1880 ◽  
Author(s):  
Xue Li ◽  
Tieqiao Chen ◽  
Yuta Saga ◽  
Li-Biao Han
Keyword(s):  
Bond Formation ◽  
Cross Coupling ◽  
Efficient Synthesis ◽  
Mild Conditions ◽  
Reaction Proceeds ◽  
First Time

An efficient P–C bond-formation through iron-catalyzed cross coupling of P–H/C–O bonds is developed for the first time. This reaction proceeds efficiently to produce the corresponding valuable α-alkoxyphosphorus compounds under mild conditions with a wide generality.

CuI nanoparticles as recyclable heterogeneous catalysts for C–N bond formation reactions

2017 ◽  
Vol 7 (13) ◽  
pp. 2857-2864 ◽  
Author(s):  
Manoranjan Kumar ◽  
Vinod Bhatt ◽  
Onkar S. Nayal ◽  
Sushila Sharma ◽  
Vishal Kumar ◽  
...  
Keyword(s):  
Carbonyl Compounds ◽  
Heterogeneous Catalysts ◽  
Reductive Amination ◽  
Bond Formation ◽  
Copper Iodide ◽  
First Time ◽  
Bond Formation Reactions

Herein, copper iodide nanoparticles (NPs) are reported for the reductive amination of carbonyl compounds for the first time.

Dissolution and Performing Homogeneous Photocatalysis of Polymeric Carbon Nitride

2018 ◽  
Author(s):  
Chaofeng Huang ◽  
Jing Wen ◽  
Yanfei Shen ◽  
Fei He ◽  
Li Mi ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Carbon Nitride ◽  
Heterogeneous Catalysts ◽  
Methane Sulfonic Acid ◽  
Environment Friendly ◽  
The Poor ◽  
Catalytic Sites ◽  
Homogeneous Photocatalysis ◽  
Polymeric Carbon ◽  
First Time

<a></a><a>As a metal-free conjugated polymer, carbon nitride (CN) has attracted tremendous attention as heterogeneous (photo)catalysts. </a><a></a><a>By following prototype of enzymes, making all catalytic sites of accessible via homogeneous reactions is a promising approach toward maximizing CN activity, but hindered due to </a><a></a><a>the poor insolubility of CN</a>. Herein, we report the dissolution of CN in environment-friendly methane sulfonic acid and the homogeneous photocatalysis driven by CN for the first time with the activity boosted up to 10-times, comparing to the heterogeneous counterparts. Moreover, facile recycling and reusability, the <a>hallmark</a> of heterogeneous catalysts, were kept for the homogeneous CN photocatalyst via reversible precipitation using poor solvents. It opens new vista of CN in homogeneous catalysis and offers a successful example of polymeric catalysts in bridging gaps of homo/heterogeneous catalysis.

Microwave-Assisted Decarbonylation of Biomass-Derived Aldehydes Using Pd-Doped Hydrotalcites

2019 ◽  
Author(s):  
Nan An ◽  
Diana Ainembabazi ◽  
Kavya Samudrala ◽  
Christopher Reid ◽  
Kare Wilson ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Reaction Times ◽  
Inverse Correlation ◽  
Mulliken Charge ◽  
Metal Leaching ◽  
Carbonyl Carbon ◽  
Mild Conditions ◽  
Microwave Assisted ◽  
Biomass Processing ◽  
Alcohol Dehydrogenation

<p>Here we report the synthesis, characterization and activity of tunable Pd-doped hydrotalcites (Pd-HTs) for the decarbonylation of furfural, hydroxymethylfurfural (HMF), aromatic and aliphatic aldehydes under microwave conditions. The decarbonylation activity reported is a notable improvement over prior heterogeneous catalysts for this process. Furfural decarbonylation is optimized in a benign solvent compatible with biomass processing - ethanol, under relatively mild conditions and short reaction times. HMF selectively affords excellent yields of furfuryl alcohol with no humin formation, but longer reaction can also afford furan via tandem alcohol dehydrogenation and decarbonylation. Yields of substituted benzaldehydes are related to calculated Mulliken charge of the carbonyl carbon. The activity and selectivity differences can be traced to loading-dependent differences in Pd speciation on the catalysts. Poisoning studies show inverse correlation between Pd loading and metal leaching: Pd-HTs with lowest Pd loading, which consist of highly dispersed and oxidized Pd species, operate heterogeneously with negligible metal leaching. Recycling experiments are consistent with this trend, offering potential for further optimization to improve robustness.</p>

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