Results 141 to 150 of about 17,166 (245)

The influence of support in Ziegler-Natta catalysts for olefin polymerization

Revista Técnica de la Facultad de Ingeniería, 2011
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A. Parada, F. Medina, A. Meyer, C. De La Cruz   +3 more
doaj  

Olefin Polymerization [PDF]

, 1999
openaire   +1 more source

Pharmaceuticals Made with Hydrogen: A Sustainable and Efficient Approach Using Flow Synthesis

Chemistry – A European Journal, EarlyView.
We demonstrate a sustainable strategy for pharmaceutical manufacturing by combining hydrogen, heterogeneous catalysis, and continuous flow synthesis. The development of novel catalysts and their application in a multi‐step synthesis of donepezil enabled a highly productive process with no intermediate purification.
Shū Kobayashi, Haruro Ishitani
wiley   +1 more source

Self‐assembly and Lateral Cobalt Coordination of a Fivefold Symmetric Cyanostar Macrocycle on an Au(111) Surface

Chemistry – A European Journal, EarlyView.
Herein, we report the first example of the formation of a close‐packed, regular 2D monolayer of a fivefold symmetric cyanostar macrocycle on an Au(111) surface under ultra‐high vacuum and the structural modification of such self‐assembled architecture upon cobalt atom deposition.
Lenka Černá, Miguel Martínez García, Shanmugasibi K. Mathialagan, Sofía O. Parreiras, Koen Lauwaet, José Ignacio Urgel, Aurelio Gallardo, Amar H. Flood, Tomás Torres, José M. Gallego, Giovanni Bottari, David Écija   +11 more
wiley   +1 more source

One‐Pot Transition‐Metal‐Free Methods for the Synthesis of All Three Bonds of the Alkyne's Triple Bond

Chemistry – A European Journal, EarlyView.
One‐pot transition‐metal‐free methods for the synthesis of all three bonds of the alkyne's triple bond are reviewed. After analysis of several named reactions and discussion of improvements, recent advances in the synthesis of alkynes are discussed. Each section contains a proposed reaction mechanism and analysis of the strengths and weaknesses of the ...
Eugene Kim, Yu Wu, Judith N. Currano, Jianyou Mao, Patrick J. Walsh   +4 more
wiley   +1 more source

Harnessing Toluene Solvent as a Reactant: Regioselective Benzyl Radical Addition to Multi‐π 1,5‐Enynes in a Copper‐Catalyzed Cascade to Indenes

Chemistry – A European Journal, EarlyView.
A copper‐catalyzed three‐component radical cascade of 1,5‐enynes with toluene and benzoic acids enables regioselective benzyl radical addition to multi‐Π systems, efficiently delivering polysubstituted indenes from an abundant solvent feedstock. ABSTRACT C─H activation of toluene generates a benzyl radical that undergoes C─C coupling, converting an ...
Saideh Rajai‐Daryasarei, Fatemeh Chahardehi, Mohammad Mahdi Sharifani, Morteza Jamshidi, Robert Stranger, Frank Rominger, Alireza Ariafard, Saeed Balalaie   +7 more
wiley   +1 more source

Rh‐Catalyzed [2 + 2 + 2] Cycloaddition of Linked Bis(Diynes) Ar‐C≡C‐C≡C‐(CH2)3‐C≡C‐C≡C‐Ar With Quinones: Synthesis and Photophysical Properties of Bis(Arylethynyl)‐Naphthoquinones and Anthraquinones

Chemistry – A European Journal, EarlyView.
We report the synthesis bis(arylethynyl)naphtho‐ and anthraquinones via Rh(I)‐catalyzed [2 + 2 + 2] cycloaddition reactions. The substrate scope of both quinones and linked bis‐diynes was explored. Microwave irradiation remarkably enhanced yields.
Luana A. Machado, Jianhua Han, Fábio G. Delolo, Joyce C. Oliveira, Breno U. Abreu, Hállen D. R. Calado, Joannes Krebs, Leibo Tan, Qing Ye, Tobias Groß, Christoph Lambert, Camille Latouche, Abdou Boucekkine, Jean‐François Halet, Holger Braunschweig, Todd B. Marder, Eufrânio N. da Silva Júnior   +16 more
wiley   +1 more source

Silent Partners in the Mill: Unveiling the Role of Additives in Mechanochemical Synthesis

Chemistry – A European Journal, EarlyView.
Mechanochemistry offers a sustainable, solvent‐free alternative to traditional synthesis, often enhanced by additives in a process known as additive‐assisted grinding. This review discusses how various additives, including liquids, ionic solids, and advanced materials like ionic liquids and piezoelectric compounds, improve reaction efficiency ...
Johanna Breinsperger, Nika Podlesnik, Francesco Mele, Michael Schnürch   +3 more
wiley   +1 more source

C4 olefin conversion on reduced nickel y faujasite. Evidence for C5 olefin formation via C4 olefin disproportionation [PDF]

, 1984
A. Barth, B. E. Langner, D. W. Breck, F. E. Shepard, G. Schulz-Ekloff, H. Kocirek, J. Datka, L. Kubelkova, M. L. Poutsma, N. Davidova, N. Jaeger, N. W. Cant, P. E. Eberly Jr., P. J. Plath, R. F. Sullivan, Th. Bein   +15 more
core   +1 more source

Olefin polymerization

Focus on Catalysts, 2006
openaire   +1 more source