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68 Aktuelle Fachpublikationen zum Thema Addition

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[Report] Catalytic asymmetric addition of Grignard reagents to alkenyl-substituted aromatic N-heterocycles

22.04.2016 | Ravindra P. Jumde; Francesco Lanza; Marieke J. Veenstra; Syuzanna R. Harutyunyan, Science , 2016

Catalytic asymmetric conjugate addition reactions represent a powerful strategy to access chiral molecules in contemporary organic synthesis. However, their applicability to conjugated alkenyl-N-heteroaromatic compounds, of particular interest in medicinal chemistry, has lagged behind ...

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[Perspective] Unraveling a pathway to autism

11.03.2016 | J. Peter H. Burbach, Science , 2016

Autism spectrum disorders (ASDs) are a heterogeneous group of neurodevelopmental disorders with shared symptoms in the area of communication and language, restricted interests, and stereotyped and social behaviors. Causes lie in perturbations of brain development, which can be manifold, but ...

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[Perspective] An RNA twist to TH17 cells

04.03.2016 | Maninjay K. Atianand; Katherine A. Fitzgerald, Science , 2016

T helper lymphocytes play essential roles in the adaptive immune system. They come in distinct types defined by unique transcriptional programs that control their development and functions. Among these, T helper 17 (TH17) cells are important in protecting mucosal surfaces against fungal and ...

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[Report] Palladium-tin catalysts for the direct synthesis of H2O2 with high selectivity

26.02.2016 | Simon J. Freakley; Qian He; Jonathan H. Harrhy; Li Lu; David A. Crole; David J. Morgan; Edwin N. Ntainjua; Jennifer ..., Science , 2016

The direct synthesis of hydrogen peroxide (H2O2) from H2 and O2 represents a potentially atom-efficient alternative to the current industrial indirect process. We show that the addition of tin to palladium catalysts coupled with an appropriate heat treatment cycle switches off the sequential ...

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[Report] An aromatic ion platform for enantioselective Brønsted acid catalysis

26.02.2016 | Chirag D. Gheewala; Bridget E. Collins; Tristan H. Lambert, Science , 2016

Chiral acid catalysts are useful for the synthesis of enantioenriched small molecules, but the standard catalysts require laborious and expensive preparations. Here, we describe a chiral Brønsted acid prepared in one step from naturally occurring (–)-menthol and readily available ...

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[Perspective] A molecular shuttle for hydrogen cyanide

19.02.2016 | Hans-Günther Schmalz, Science , 2016

In recent decades, transition-metal catalysis has become an indispensable tool in organic synthesis. Nevertheless, there remains a need for practical, safe, and efficient protocols for some transformations. A challenging example is nickelcatalyzed hydrocyanation (1), in which nonactivated olefins ...

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[Report] Oxygen isotopic evidence for vigorous mixing during the Moon-forming giant impact

29.01.2016 | Edward D. Young; Issaku E. Kohl; Paul H. Warren; David C. Rubie; Seth A. Jacobson; Alessandro Morbidelli, Science , 2016

Earth and the Moon are shown here to have indistinguishable oxygen isotope ratios, with a difference in Δ′17O of −1 ± 5 parts per million (2 standard error). On the basis of these data and our new planet formation simulations that include a realistic model for primordial oxygen isotopic ...

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[Perspective] Interlacing molecular threads

22.01.2016 | Enrique Gutierrez-Puebla, Science , 2016

The synthesis of organic materials has typically involved linking one or more types of discrete molecular building blocks to produce structures that are extended in three dimensions. For example, repeated addition of monomers results in the formation of organic polymers that have randomly packed ...

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[Report] Archean upper crust transition from mafic to felsic marks the onset of plate tectonics

22.01.2016 | Ming Tang; Kang Chen; Roberta L. Rudnick, Science , 2016

The Archean Eon witnessed the production of early continental crust, the emergence of life, and fundamental changes to the atmosphere. The nature of the first continental crust, which was the interface between the surface and deep Earth, has been obscured by the weathering, erosion, and tectonism ...

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[Business Office Feature] Automated sample preparation

15.01.2016 | Mike May, Science , 2016

Devices to prepare cells, nucleic acids, proteins, and other samples for analysis are becoming increasingly sophisticated, running faster and more accurately than ever before. In addition, their ease of use is making it possible to quickly train almost anyone to run automated sample ...

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