Results 291 to 300 of about 3,470,234 (405)

Highly Efficient Organocatalytic House‐Meinwald Rearrangement for the Facile Synthesis of Aldehydes: Swift Access to Ibuprofen

Chemistry – A European Journal, EarlyView.
We use readily available epoxides and 0.5 mol% bis(trifluoromethane)sulfonimide (Tf2N) as a catalyst to synthesize a broad range of aldehydes in yields ranging from 89% to 97%. Furthermore, we identified aldehyde dimerization intermediates at lower temperatures and observed their cleavage at 55 °C.
Friedemann Dressler, Ihssane El Fdali, Luisa L. Ciezarek, Peter R. Schreiner   +3 more
wiley   +1 more source

Deprotective Functionalization: An Emerging Concept for Amine Reactivity

Chemistry – A European Journal, EarlyView.
While protecting groups are indispensable in total synthesis to avoid undesired reactivity, installation and removal of protecting groups lead to an increase in the step‐count, cost, waste production and time requirement. One approach tackling these drawbacks is deprotective functionalization, which combines deprotection and postfunctionalization in a ...
Irmgard Tiefenbrunner, Saad Shaaban, Nuno Maulide   +2 more
wiley   +1 more source

Les toilettes du pape, 1988-2005-2007.

Nuevo mundo - Mundos Nuevos, 2008
Boris Jeanne
doaj   +1 more source

Global human appropriation of net primary production doubled in the 20th century

Proceedings of the National Academy of Sciences of the United States of America, 2013
F. Krausmann, K. Erb, S. Gingrich, H. Haberl, A. Bondeau, V. Gaube, C. Lauk, C. Plutzar, T. Searchinger   +8 more
semanticscholar   +1 more source

Cyclopropenes in Photochemical Reactions

Chemistry – A European Journal, EarlyView.
The photochemical side of cyclopropenes. Cyclopropenes are valuable synthetic tools in organic chemistry. In particular, this review focuses on the photochemistry of cyclopropenes. The reactivity of cyclopropenes excited by irradiation is discussed showing their unique potential for organic synthesis.
David Suárez‐García, Darío Coto, Rubén Vicente   +2 more
wiley   +1 more source

Faire voter les morts

Nuevo mundo - Mundos Nuevos, 2008
Boris Jeanne
doaj   +1 more source

Using full-text content to characterize and identify best seller books: A study of early 20th-century literature. [PDF]

PLoS One
da Silva GD, Silva FN, de Arruda HF, E Souza BC, Costa LDF, Amancio DR.   +5 more
europepmc   +1 more source

Experimental methods in chemical engineering: Electrospinning

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract Electrospinning produces micro‐ and nanofibres by forcing a polymeric solution through a fine needle in an electric field that produces a filament that accumulates onto a collector plate. The fibre morphology depends on solution properties, distance between needle and plate, feed rate, and electric field intensity.
M. Olga Guerrero‐Pérez, Tugce N. Eran, Gregory S. Patience   +2 more
wiley   +1 more source

Chemical Aspects Influencing Crack Formation in Black‐and‐White Oil‐Based Paints: Study of Five Spanish Abstract Informalist Paintings by Antonio Saura (1930–1998)

Chemistry–Methods, EarlyView.
This study explores the chemical and physical mechanisms behind the distinct cracking patterns observed in the black‐painted areas of five works by Antonio Saura. Multiband imaging and portable digital microscopy were employed to document the morphology and distribution of crack patterns.
Margherita Gnemmi, Anna Vila EspuÑa, Miguel Ángel Herrero‐Cortell, Marcello Picollo, Laura Falchi, Elena Davanzo, Laura Fuster‐López, Francesca Caterina Izzo   +7 more
wiley   +1 more source

The ailments that stem from cheese and relevant precautions taken in the Ottoman Empire from the 19th century to the 20th century. [PDF]

Food Sci Nutr
Erkmen A, Tüzün N, Erkmen O.
europepmc   +1 more source