Palabras clave: Par de Lewis Frustrado; Metales de Transición; Catálisis Cooperativa.
Abstract: Frustrated Lewis Pair chemistry has experienced an exponential growth during the last decade, in part due to its high potential in catalysis. However, FLP-mediated catalysis seems to be limited to a reduced number of transformations, which can be attributed to the reluctance of their constituent main group elements to mediate most fundamental elementary reactions. On the contrary, FLP systems based on transition metals appear as a nascent area of chemistry that could overcome those limitations offering great advantages for catalysis.
Keywords: Frustrated Lewis Pair; Transition Metals; Cooperative Catalysis.
Palabras clave: Formación enlaces C-C, catálisis cooperativa, cobre, paladio, hidrocarburos insaturados.
Abstract: Traditionally, transition metal catalyzed C-C bond forming reactions have been developed using pre-made organometallic reagents. These procedures are inherently limited to the availability and reactivity profiles of the reagent itself and entail the formation of a stoichiometric amount of inorganic salt as a reaction by-product. One of the major challenges in modern synthetic chemistry is the development of sustainable and atom-efficient C-C bond forming reactions. In this context, catalytic transformations using simple and abundant organic ma- terials as latent organometallic equivalents under cooperative bimetallic catalysis provide more efficient and operationally simpler processes than when stoichiometric quantities of sensitive intermediates are required.
Keywords: C-C bond formation, cooperative catalysis, copper, palladium, unsaturated hydrocarbons.
Casos Reales: Los Nuevos precursores en Síntesis de Anfetaminas
Delfina Pastor Rodriguez, Julia Alonso Roque
Palabras clave: APAAN, glicidato de PMK, P2P, anfetamina, MDMA.
Abstract: The control authority of the BMK and PMK purchase, has resulted in the emergence of new products used as pre-precursors foramphetamine synthesis in Europe. This article shows the new paths to obtaining the main precursor in amphetamine synthesis.Keywords: APAAN, PMK glicidate, P2P, amphetamine, MDMA.
Historia de la Química
El legado de Rachel Carson
Silvia Pérez Criadoz
Palabras clave: Rachel Carson, Primavera Silenciosa, Controversia, DDT, Pesticidas, Movimiento Ecologista.
Abstract: On the occasion of the celebration of the fiftieth anniversary of the publication of Silent Spring in 2012, several papers went through the book content and the controversy around it. In this work, these publications on Environmental History have been analysed. Our interest has been focused not only on the environmental problems arising from the misuse of DDT but also the controversies generated due to its misuse and the publication of the book itself. Nowadays, these controversies remain open.
Keywords: Rachel Carson, Silent Spring, Controversy, DDT, Pesticide, Ecological Movement.
Enseñanza de la Química
Acerca de la perturbación de equilibrios químicos, el control de variables y las predicciones de la evolución subsiguiente: discusión de un ejercicio de pruebas de acceso a la universidad
Juan Quílez Pardo
Palabras clave: control de variables, equilibrio químico, principio Le Châtelier, cociente de reacción, concentración.
Abstract: In this study, it is discussed a problem that deals with the disturbance of a chemical equilibrium mixture. This problem corres- ponds to the last chemistry exam to access university. It is analysed the possible deficiencies in the statements of the related problems, par- ticularly when checking if they control the variables involved. In this respect, we examine the difficulties that are associated to the capacity to make accurate predictions corresponding to the changes the equilibrium mixture experiences in different situations. This analysis allows to establish some recommendations on the particular cases where it should be appropriate to assess this issue in a pre-university level of Chemistry.
Keywords: control of the variables involved, chemical equilibrium, Le Châtelier’s principle, reaction quotient, concentration.
Keywords: gamification, virtual laboratories, constructivism, significant learning, simulations
Ronald Breslow (1931-2017) in Memoriam
Miguel Ángel Sierra
Gilbert Stork (1921-2017) In Memoriam
Miguel Ángel Sierra
Keiji Morokuma (1934-2017)
Reseñas de Libros
Chemistry Squared (Chem2)
La gran aventura del cristal
Pilar Gómez Sal