Results 151 to 160 of about 2,457 (204)

Lewis Acid Organocatalysts

2009
Abstract The term Lewis acid catalysts generally refers to metal salts like aluminium chloride, titanium chloride and zinc chloride. Their application in asymmetric catalysis can be achieved by the addition of enantiopure ligands to these salts. However, not only metal centers can function as Lewis acids.
Oksana, Sereda, Sobia, Tabassum, René, Wilhelm   +2 more
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Dope new organocatalysts for ATRP

Nature Reviews Chemistry, 2021
A re-evaluation of the design principles of organocatalysts for atom transfer radical polymerization has led to the development of heteroatom-doped polycyclic arenes as highly active photocatalysts.
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Facile Preparation of Flavinium Organocatalysts

ChemSusChem, 2016
AbstractWe developed a safe, simple, inexpensive, and environmentally benign method for preparing N(5)‐ethylated flavinium organocatalysts without using hazardous reagents or inert conditions as previously required. 5‐Ethyl‐3‐methyllumiflavinium cation was prepared from its reduced form by NaNO2‐free aerobic oxidation, which was subsequently extracted ...
Yukihiro Arakawa, Takahiro Oonishi, Takahiro Kohda, Keiji Minagawa, Yasushi Imada   +4 more
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Organocatalysts

2017
This chapter provides a guide to the most popular and reliable synthetic methods used to prepare selected organocatalysts. Some very simple guiding features are suggested that may allow the reader to assess the utility of these synthetic methods based on reliability, modularity and scalability.
Aileen B. Frost, Mark D. Greenhalgh, Andrew D. Smith   +2 more
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N‐Heterocyclic Carbenes as Organocatalysts

Angewandte Chemie International Edition, 2007
AbstractOrganocatalyzed reactions represent an attractive alternative to metal‐catalyzed processes notably because of their lower cost and benign environmental impact in comparison to organometallic catalysis. In this context, N‐heterocyclic carbenes (NHCs) have been studied for their ability to promote primarily the benzoin condensation.
Nicolas, Marion, Silvia, Díez-González, Steven P, Nolan   +2 more
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An Immobilized Organocatalyst for Cyanosilylation and Epoxidation.

ChemInform, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Kazuya Yamaguchi, Toru Imago, Yoshiyuki Ogasawara, Jun Kasai, Miyuki Kotani, Noritaka Mizuno   +5 more
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Polymeric chiral organocatalysts

Polymer Chemistry, 2011
Incorporation of a chiral quaternary ammonium salt into a polymer allows for the preparation of a polymeric chiral organocatalyst that can be utilized in various asymmetric transformations in organic synthesis. Chiral quaternary ammonium salts are among the most important and frequently used organocatalysts.
Shinichi Itsuno, Md. Masud Parvez, Naoki Haraguchi   +2 more
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Thiourea Based Fluorous Organocatalyst

2011
This review deals with general and significant development of the fluorous organocatalysts based on thiourea. The applications of fluorous technology are briefly discussed. The implementations of thiourea based catalysts in organic synthesis are focused on in the chapter.
Yi-Bo, Huang, Wen-Bin, Yi, Chun, Cai
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Alkaloid Synthesis Using Organocatalysts

2018
This chapter covers the literature since the advent, in the 21st century, of total syntheses of alkaloids using enantio- or diastereoselective organocatalytic reactions to construct the alkaloid scaffolds. The details of these alkaloid syntheses are described separately for each basic skeleton, including indole, indoline, oxindole, and piperidine ...
Hayato, Ishikawa, Shinya, Shiomi
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Chalcogenides as Organocatalysts

Chemical Reviews, 2007
McGarrigle, EM, Myers, EL, Illa, O (UG), Shaw, MA, Riches, SL, Aggarwal, VK   +5 more
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