Recyclable Cu/C3N4 composite catalysed homo- and cross-coupling of terminal alkynes under mild conditions

2018 ◽  
Vol 20 (4) ◽  
pp. 793-797 ◽  
Author(s):  
Hang Xu ◽  
Keying Wu ◽  
Jing Tian ◽  
Li Zhu ◽  
Xiaoquan Yao
Keyword(s):  
Catalytic Activity ◽  
Cross Coupling ◽  
Composite Catalyst ◽  
Terminal Alkynes ◽  
Mild Conditions ◽  
Good Catalytic Activity

A facile, practical and recyclable Cu–N–C composite catalyst with good catalytic activity for both homo- & cross-coupling of terminal alkynes.

A highly efficient catalyst for Suzuki–Miyaura coupling reaction of benzyl chloride under mild conditions

RSC Advances ◽  
2014 ◽  
Vol 4 (69) ◽  
pp. 36437-36443 ◽  
Author(s):  
Zhenhong Guan ◽  
Buyi Li ◽  
Guoliang Hai ◽  
Xinjia Yang ◽  
Tao Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Benzyl Chloride ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Efficient Catalyst ◽  
Microporous Polymers ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Cross Coupling Reactions

Microporous polymers with built-in triphenylphosphine palladium exhibit highly efficient catalytic activity for cross-coupling reactions of benzyl chloride under mild conditions.

Air-stable Pd(0) catalyst bearing dual phosphine ligands: a detailed evaluation of air stability and catalytic property in cross-coupling reactions

2020 ◽  
Vol 49 (36) ◽  
pp. 12814-12819
Author(s):  
Ryota Sato ◽  
Takaki Kanbara ◽  
Junpei Kuwabara
Keyword(s):  
Catalytic Activity ◽  
Catalytic Property ◽  
Cross Coupling ◽  
Phosphine Ligands ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Donor And Acceptor ◽  
Detailed Evaluation ◽  
Good Catalytic Activity

The Pd(0) complex bearing donor and acceptor phosphine ligands shows long-term air stability and good catalytic activity even in a reaction with a relatively inactive substrate.

ChemInform Abstract: Enaminone Ligand-Assisted Homo- and Cross-Coupling of Terminal Alkynes under Mild Conditions.

ChemInform ◽  
2013 ◽  
Vol 44 (44) ◽  
pp. no-no
Author(s):  
Yunyun Liu ◽  
Chunping Wang ◽  
Xiaobo Wang ◽  
Jie-Ping Wan
Keyword(s):  
Cross Coupling ◽  
Terminal Alkynes ◽  
Mild Conditions

Surfactant PVA-Stabilized Co–Mo Nanocatalyst Supported by Graphene Oxide Sheets Toward the Hydrolytic Dehydrogenation of Ammonia Borane

NANO ◽  
2019 ◽  
Vol 14 (11) ◽  
pp. 1950137 ◽  
Author(s):  
Xin Zhao ◽  
Dandan Ke ◽  
Shumin Han ◽  
Yuan Li ◽  
Hongming Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Amorphous State ◽  
Ammonia Borane ◽  
Molar Ratio ◽  
Composite Catalyst ◽  
Catalyst Carrier ◽  
Bimetallic Composite ◽  
Good Catalytic Activity ◽  
Graphene Oxide Sheets

By adding surfactant polyvinyl alcohol (PVA) and controlling the preparation process, we successfully synthesized Co–Mo catalysts. For further improving the dispersion, reduced graphene oxide sheets as catalyst carrier were introduced to synthesize Co–Mo@rGO composite catalyst as highly efficient catalysts for hydrolytic dehydrogenation of ammonia borane. The introduction of Mo for preparing Co–Mo@rGO catalyst helped to form alloy catalyst with better structure, better dispersity and smaller particle size. When the molar ratio of Co and Mo was 0.75:0.25, the bimetallic composite catalyst exhibited superior activity with TOF value of 16.29[Formula: see text]mol[Formula: see text]. The activation energy of the reaction was calculated to be 43.72[Formula: see text]kJ[Formula: see text][Formula: see text]. Furthermore, the reusability tests reveal that waxberry-like Co–Mo still show good catalytic activity with 80.3% of their initial activity in five successive runs. The enhanced catalytic activities were due to the synergistic interaction between graphene sheets and waxberry-like Co–Mo NPs, which was beneficial to improve the dispersion and stability of bimetallic NPs. Also, ligand effects on the formation of waxberry-like structure and amorphous state further promoted the catalytic activity.

scholarly journals Synthesis of Alkynyl Ketones by Sonogashira Cross-Coupling of Acyl Chlorides with Terminal Alkynes Mediated by Palladium Catalysts Deposited over Donor-Functionalized Silica Gel

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1186
Author(s):  
Miloslav Semler ◽  
Filip Horký ◽  
Petr Štěpnička
Keyword(s):  
Silica Gel ◽  
Palladium Catalysts ◽  
Cross Coupling ◽  
Significant Loss ◽  
Terminal Alkynes ◽  
Reaction Conditions ◽  
Co Catalyst ◽  
Acyl Chlorides ◽  
Good Catalytic Activity ◽  
Repeated Use

Palladium catalysts deposited over silica gel bearing simple amine (≡Si(CH2)3NH2) and composite functional amide pendants equipped with various donor groups in the terminal position (≡Si(CH2)3NHC(O)CH2Y, Y = SMe, NMe2 and PPh2) were prepared and evaluated in Sonogashira-type cross-coupling of acyl chlorides with terminal alkynes to give 1,3-disubstituted prop-2-yn-1-ones. Generally, the catalysts showed good catalytic activity in the reactions of aroyl chlorides with aryl alkynes under relatively mild reaction conditions even without adding a copper co-catalyst. However, their repeated use was compromised by a significant loss of activity after the first catalytic run.

Enaminone ligand-assisted homo- and cross-coupling of terminal alkynes under mild conditions

2013 ◽  
Vol 54 (30) ◽  
pp. 3953-3955 ◽  
Author(s):  
Yunyun Liu ◽  
Chunping Wang ◽  
Xiaobo Wang ◽  
Jie-Ping Wan
Keyword(s):  
Cross Coupling ◽  
Terminal Alkynes ◽  
Mild Conditions

Efficient Catalysts of Acyclic Guanidinium Iodide for the Synthesis of Cyclic Carbonates from Carbon Dioxide and Epoxides under Mild Conditions

Synthesis ◽  
2019 ◽  
Vol 52 (01) ◽  
pp. 150-158 ◽  
Author(s):  
Naoto Aoyagi ◽  
Yoshio Furusho ◽  
Takeshi Endo
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Cycloaddition Reactions ◽  
Cyclic Carbonates ◽  
Polar Solvents ◽  
Mild Conditions ◽  
Iodide Ion ◽  
Good Catalytic Activity ◽  
High Yields ◽  
Guanidinium Salts

We have studied the synthesis of five-membered cyclic carbonates through the cycloaddition of CO2 to epoxides by using acyclic guanidinium salts. We have found that the cycloaddition reactions proceed smoothly at ordinary temperatures and pressures and result in good yields when acyclic guanidinium iodides are employed as catalysts. Both cation moiety and anion moiety of the guanidinium salts play important roles in their catalytic activity. It is essential to have active hydrogens on the cation moiety as well as an iodide ion as the anion moiety so as to achieve good catalytic activity. Guanidinium iodides with three or more active hydrogens give cyclic carbonates in high yields in polar solvents such as 1-methylpyrrolidin-2-one, whereas the guanidinium iodides with one or two active hydrogens show good catalytic activity in less polar solvents such as 2-methyltetrahydrofuran.

scholarly journals Au(I)/Au(III)-catalyzed Sonogashira-type reactions of functionalized terminal alkynes with arylboronic acids under mild conditions

2011 ◽  
Vol 7 ◽  
pp. 808-812 ◽  
Author(s):  
Deyun Qian ◽  
Junliang Zhang
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Catalyst System ◽  
Terminal Alkynes ◽  
Arylboronic Acids ◽  
Mild Conditions ◽  
Redox Catalyst ◽  
Cross Coupling Reaction

A straightforward, efficient, and reliable redox catalyst system for the Au(I)/Au(III)-catalyzed Sonogashira cross-coupling reaction of functionalized terminal alkynes with arylboronic acids under mild conditions has been developed.

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.

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