Results 21 to 30 of about 7,051 (128)

Chiral gold(I) vs chiral silver complexes as catalysts for the enantioselective synthesis of the second generation GSK-hepatitis C virus inhibitor

Beilstein Journal of Organic Chemistry, 2011
The synthesis of a GSK 2nd generation inhibitor of the hepatitis C virus, by enantioselective 1,3-dipolar cycloaddition between a leucine derived iminoester and tert-butyl acrylate, was studied.
María Martín-Rodríguez, Carmen Nájera, José M. Sansano, Abel de Cózar, Fernando P. Cossío   +4 more
doaj   +1 more source

Tandem cross enyne metathesis (CEYM)–intramolecular Diels–Alder reaction (IMDAR). An easy entry to linear bicyclic scaffolds

Beilstein Journal of Organic Chemistry, 2015
A new tandem cross enyne metathesis (CEYM)–intramolecular Diels–Alder reaction (IMDAR) has been carried out. It involves conjugated ketones, esters or amides bearing a remote olefin and aromatic alkynes as the starting materials.
Javier Miró, María Sánchez-Roselló, Álvaro Sanz, Fernando Rabasa, Carlos del Pozo, Santos Fustero   +5 more
doaj   +1 more source

Uso de modelado molecular como herramienta didáctica en el primer curso de grado de Química Orgánica

Educación Química, 2018
El primer curso de Química Orgánica (Química Orgánica 101) de la Facultad de Química, Universidad de la República (Montevideo, Uruguay) se dicta para las carreras de Química Farmacéutica, Ingeniería Química, Química, Bioquímica Clínica e Ingeniería en ...
Gustavo Seoane, Hugo Cerecetto, M. Boiani, M. González, Marina Miguez Palermo, P. Buccino, P. Saenz, Silvia Loureiro, V. López, Ximena Otegui   +9 more
doaj   +1 more source

Stepwise On‐Surface Synthesis and Transformations of Two‐Dimensional Covalent Organic Frameworks by Controlled Thermal Stimuli

Advanced Materials, EarlyView.
The seminal transformation of a 2D‐COF (SURFCOF‐IMDEA1) into a 2D porous COF (SURFCOF‐IMDEA2) on Au(111) by a sequential C‐C coupling and ladderization triggered by thermal annealing steps at increasing temperatures is reported. Abstract The development of covalent organic frameworks (COFs) is currently a primary objective in materials science, taking ...
Ana Barragán, Elena Pérez‐Elvira, Diego J. Vicent, Marco Lozano, Diego Soler‐Polo, Koen Lauwaet, José M. Gallego, Rodolfo Miranda, José I. Urgel, Pavel Jelínek, Nazario Martín, David Écija   +11 more
wiley   +1 more source

New Short Strategy for the Synthesis of the Dibenz[b,f]oxepin Scaffold

Molecules, 2013
In this report a short and efficient synthesis of the dibenz[b,f]oxepin framework through intramolecular SNAr and McMurry reactions is described. The diaryl ethers required for the McMurry reaction have been obtained in good yields under microwave ...
David R. R. Moreno, Giorgio Giorgi, Cristian O. Salas, Ricardo A. Tapia   +3 more
doaj   +1 more source

Counterintuitive Fluorescence Blue Shift in Symmetry Breaking Dicationic Bis(indolium) with Two‐Photon Absorption Properties for NIR Living Cell Imaging

Advanced Materials, EarlyView.
Highly water‐soluble dicationic bis(indolium) dyes have been prepared, showing excellent two‐photon absorption and light emission. Their fluorescence behavior discloses an unusual increasing blue shift with increasing solvent polarity, which, in parallel, is beneficial for enhanced detection in biological media.
Carlos Benitez‐Martin, Jose M. Marin‐Beloqui, Juan T. López Navarrete, Juan Casado, Francisco Najera, Ezequiel Perez‐Inestrosa   +5 more
wiley   +1 more source

Unprecedented Elimination Reactions of Cyclic Aldols: A New Biosynthetic Pathway toward the Taiwaniaquinoid Skeleton

Molecules, 2023
The acid treatment of 6,7-seco-abietane dialdehydes gives, in high yield, the corresponding derivatives with the 4a-methyltetrahydrofluorene skeleton of taiwaniaquinoids.
Juan J. Guardia, Antonio Fernández, José Justicia, Houda Zentar, Ramón Alvarez-Manzaneda, Enrique Alvarez-Manzaneda, Rachid Chahboun   +6 more
doaj   +1 more source

Self‐Cooling Molecular Spin Qudits

Advanced Materials, EarlyView.
A material made of [GdEr] molecular dimers can encode a qudit and perform as a magnetic refrigerant. Microwave resonant pulses coherently manipulate its 16 spin states, while direct demagnetization measurements cool the material and a device down to temperatures below 1 K.
Elías Palacios, David Aguilà, David Gracia, Diamatoula Maniaki, Leoní A. Barrios, Alessandro Chiesa, Jesús I. Martínez, Valentin Novikov, Olivier Roubeau, Stefano Carretta, Marco Evangelisti, Guillem Aromí, Fernando Luis   +12 more
wiley   +1 more source

A Cu‐Based Near‐IR Active MOF with an Ion‐Pair Guest Exhibiting Versatile and Selective Gas‐Solid Reactivity

Advanced Materials, EarlyView.
The new Cu‐containing MOF (Me2NH2)(CuICl2)@[Cu4(INA)4Cl2O]·1.5dmf (3) contains a cation and an anion as guests and shows UV‐near‐mid‐IR absorption and near‐IR emission. MOF 3 shows gas‐solid reactivity in the presence of NH3 and HCOOH to yield two new 3D MOF.
Rajat Saha, Alejandro Cortés‐Villena, Silvia Gómez‐Coca, Alberto Fernández‐Alarcón, Joaquín Calbo, Raquel E. Galian, Enrique Ortí, Eliseo Ruiz, Mónica Giménez‐Marqués, Samia Benmansour, Carlos J. Gómez‐García   +10 more
wiley   +1 more source

Una reacción multicomponente verde en el laboratorio de química orgánica

Educación Química, 2018
En este siglo, los químicos se han encontrado con un nuevo desafío: producir de manera eficiente los materiales necesarios para mantener la calidad de vida de los seres vivos, reduciendo los efectos negativos sobre el medio ambiente y la salud humana. En
Mariana Ingold, Rosina Dapueto, Gloria V. Lopez, Williams Porca   +3 more
doaj   +1 more source