Results 311 to 320 of about 705,088 (330)
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ChemInform, 2001
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.
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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.
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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.
A Stephen K, Hashmi, Graham J, Hutchings
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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.
A Stephen K, Hashmi, Graham J, Hutchings
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BioEssays, 1986
AbstractUntil the discovery of catalytic RNA, the notion that all enzymes are proteins had seemed incontrovertible. Now the existence of RNA enzymes has been confirmed in a variety of contexts. What is known about the chemistry of RNA‐catalyzed reactions is reviewed below, with particular attention to the self‐splicing rRNA intron of Tetrahymena ...
David S. Waugh, Norman R. Pace
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AbstractUntil the discovery of catalytic RNA, the notion that all enzymes are proteins had seemed incontrovertible. Now the existence of RNA enzymes has been confirmed in a variety of contexts. What is known about the chemistry of RNA‐catalyzed reactions is reviewed below, with particular attention to the self‐splicing rRNA intron of Tetrahymena ...
David S. Waugh, Norman R. Pace
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Nature Chemistry, 2020 A heterodinuclear MgCo catalyst has been shown to be highly active for the copolymerization of CO2 and epoxides under low (atmospheric) CO2 pressures. Its performance arises from the intramolecular synergy between the two metals, which adopt distinct roles and mediate each other’s reactivity during catalysis.
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Supramolecular catalysis: Refocusing catalysis
2008This chapter contains sections titled:* Introduction: A Brief Personal History* Secondary Phosphines or Phosphites as Supramolecular Ligands* Host-Guest Catalysis* Ionic Interactions as a Means to Form Heterobidentate Assembly Ligands* Ditopic Ligands for the Construction of Bidentate Phosphine Ligands* Conclusions and ...
van Leeuwen, P.W.N.M., Freixa, Z.
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Nature Chemistry, 2018 Probing single-atom alloys has shown that, when interactions between the components are weak, the electronic structure of the dilute element resembles that of a free atom, making bonding with reactants more like that in molecular homogeneous catalysts.
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2005
Publisher Summary This chapter presents the types of catalysis, namely, homogeneous catalysis, biocatalysis, and heterogeneous catalysis. In case of homogeneous catalysis, a catalyst is in the same phase as the reactants. This chapter further explains the three types of homogeneous catalysis: gas phase catalysis, acid-phase catalysis, and catalysis by
Tapio Salmi, Dmitry Yu. Murzin
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Publisher Summary This chapter presents the types of catalysis, namely, homogeneous catalysis, biocatalysis, and heterogeneous catalysis. In case of homogeneous catalysis, a catalyst is in the same phase as the reactants. This chapter further explains the three types of homogeneous catalysis: gas phase catalysis, acid-phase catalysis, and catalysis by
Tapio Salmi, Dmitry Yu. Murzin
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2009
The reversible reaction of primary or secondary amines with enolizable aldehydes or ketones affords nucleophilic intermediates, enamines. With chiral amines, catalytic enantioselective reactions via enamine intermediates become possible. In this review, structure-activity relationships and the scope as well as current limitations of enamine catalysis ...
Petri M, Pihko +2 more
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The reversible reaction of primary or secondary amines with enolizable aldehydes or ketones affords nucleophilic intermediates, enamines. With chiral amines, catalytic enantioselective reactions via enamine intermediates become possible. In this review, structure-activity relationships and the scope as well as current limitations of enamine catalysis ...
Petri M, Pihko +2 more
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HOMOGENEOUS CATALYSIS: ORGANOMETALLIC CATALYSIS AND ORGANOCATALYSIS
Catalysis in Chemistry and Biology, 2018Although soluble catalysts have been used in organic chemistry for many years, until the 1960s they involved simple acids, bases, or metal salts. In most cases, the metals were ignored in any mechanistic considerations. For example, copper salts can catalyze the cyclopropanation of olefins using diazo compounds; however, the role of copper was not ...
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