ChemInform Abstract: Use of Heterogeneous Copper Catalysts and of Acidic Mixed Oxides in Organic Synthesis

ChemInform ◽  
2010 ◽  
Vol 31 (24) ◽  
pp. no-no
Author(s):  
Nicoletta Ravasio
Keyword(s):  
Organic Synthesis ◽  
Mixed Oxides ◽  
Copper Catalysts

Copper Catalysts in the Synthesis of Five-membered N-polyheterocycles

2018 ◽  
Vol 15 (7) ◽  
pp. 940-971 ◽  
Author(s):  
Navjeet Kaur
Keyword(s):  
Transition Metal ◽  
Organic Synthesis ◽  
Copper Catalysts ◽  
Research Field ◽  
Chemoselective Synthesis ◽  
Specialized Equipment ◽  
Transition Metal Catalyzed ◽  
Synthetic Methodologies ◽  
Metal Catalyzed ◽  
Traditional Approaches

Background: Due to significant biological activity associated with N-, O- and S-heterocycles, a number of reports for their synthesis have appeared in recent decades. Traditional approaches require expensive or highly specialized equipment or would be of limited use to the synthetic organic chemist due to their highly inconvenient approaches. This review summarizes the applications of copper catalysts with the emphasis on their synthetic applications for nitrogen bearing polyheterocylces. In summary, this review article describes the synthesis of a number of five-membered poly heterocyclic rings. Objective: Nowadays new approaches that employ atom-economical and efficient pathway have been developed. The researchers are following natural models to design and synthesize heterocycles. The transition metal catalyzed protocols have attracted the attention as compared to other synthetic methodologies because they use easily available substrates to build multiple substituted complicated molecules directly under mild conditions. In organic synthesis, constituted by transition metal catalyzed coupling transformations are one of the most powerful and useful protocols. The N-heterocycles are synthesized by this convenient and useful tool. Conclusion: The efficient and chemoselective synthesis of heterocycles by this technique has appeared as an important tool. This review shows a highly dynamic research field and the employment of copper catalysts in organic synthesis. Several strategies have been pointed out in the past few years, to meet more sustainable, efficient and environmentally benign chemical products and procedures. The catalytic strategies have been the focus of intense research because they avoid the use of toxic reagents. Among these catalytic strategies, highly rewarding and an important method in heterocycles synthesis is metal catalyzed synthesis.

ChemInform Abstract: Hydrotalcite-Derived Mixed Oxides Containing Copper: Catalysts for the Removal of Nitric Oxide.

ChemInform ◽  
2010 ◽  
Vol 28 (8) ◽  
pp. no-no
Author(s):  
I. J. SHANNON ◽  
F. REY ◽  
G. SANKAR ◽  
J. M. THOMAS ◽  
T. MASCHMEYER ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Mixed Oxides ◽  
Copper Catalysts

Hydrotalcite-derived mixed oxides containing copper: catalysts for the removal of nitric oxide

1996 ◽  
Vol 92 (21) ◽  
pp. 4331 ◽  
Author(s):  
Ian J. Shannon ◽  
Fernando Rey ◽  
Gopinathan Sankar ◽  
John Meurig Thomas ◽  
Thomas Maschmeyer ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Mixed Oxides ◽  
Copper Catalysts

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

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