Alkyne-Azide Cycloaddition Catalyzed by Silver Chloride and “Abnormal” Silver N

A library of 1,2,3-triazoles was synthesized from diverse alkynes and azides using catalytic amounts of silver chloride instead of copper compounds. In addition, a novel “abnormal” silver N-heterocyclic carbene complex was tested as catalyst in this process. The results suggest that the reaction requires only 0.5% of silver complex, affording 1,2,3-triazoles in good yields

Ligand synthesis catalyst and complex metal ion: multicomponent synthesis of 1,3-bis(4-phenyl-[1,2,3]triazol-1-yl)-propan-2-ol copper(i) complex and application in copper-catalyzed alkyne-azide cycloaddition

A new bistriazole copper complex was synthesized by direct treatment of an alkyne, an azide, and CuI as copper salt through in situ ligand formation under a multicomponent reaction process. This complex was analyzed by XPS, TGA, DSC, and SEM techniques and revealed a triangular-shapedmorphology, high thermal stability, and catalytic power in CuAAC reactions, requiring only 2.5% mol catalyst to afford 1,2,3-triazoles in good yields which can be reused at least for 4 cyclesCONACYT, proyecto 13505

Use of recycled aluminum - polyethylene composite films as anodic electrodes for electrocoagulation of wastewater

artículo para uso de películas de aluminio polietilenoThis work evaluates the use of aluminum contained in the aluminum-polyethylene films as anodic electrodes using the electrocoagulation technique to reduce the pollutants contents of an industrial wastewater quickly and effectively. Two different current densities were applied 25 and 12.5 mA cm-2. When the current density of 25 mA cm-2 is used, the aluminum electrodes reduce the COD of wastewater by about 65% and the aluminum-polyethylene films electrodes reduces the COD by 56%. The color and turbidity reductions are 87 and 90% respectively. The use of aluminum-polyethylene films as electrodes in the electrocoagulation process contributes to the pollutant removal without the addition of chemical reagents or changing the pH, so it is both effective and environmentally friendly.Centro Conjunto de Investigación en Química Sustentable, UAEM-UNAM, CONACYT, UAEMe

Synthesis of EDTA core dendrimers through a consecutive esterification-CuAAC process

Artículo para obtención de grado de DoctorA novel class of thermostable G0 and G1-dendrimers was synthesized from the coupling of both propargyl and azido esters derived from EDTA through copper catalyzed azide-alkyne cycloaddition. The branching and size in these compounds were controlled by a simple azide-alkyne group position change in the CuAAC reaction in conjunction with the use of 1,3-diazido-propan-2-ol as a polyfunctional compound

Waste Cellulose from Tetra Pak Packages as Reinforcement of Cement Concrete

The development of the packaging industry has promoted indiscriminately the use of disposable packing as Tetra Pak, which after a very short useful life turns into garbage, helping to spoil the environment. One of the known processes that can be used for achievement of the compatibility between waste materials and the environment is the gamma radiation, which had proved to be a good tool for modi cation of physicochemical properties of materials. The aim of this work is to study the e ects of waste cellulose fromTetra Pak packing and gammaradiation on themechanical properties of cement concrete.Concrete specimens were elaborated with waste cellulose at concentrations of 3, 5, and 7 wt% and irradiated at 200 , 250 , and 300 kGy of gamma dose. The results show highest improvement on the mechanical properties for concrete with 3 wt% of waste cellulose and irradiated at 300 kGy; such improvements were related with the surface morphology of fracture zones of cement concrete observed by SEM microscopy

Tópicos en Química del grupo Diazo y Carbenoides

El libro expone aspectos que son menos comunes de encontrar en la literatura relacionada con la síntesis y propiedades de estas especies químicas. Abordar temas emergentes acerca del área como la generación "in sItu" de diazoalcanos a partir de p-toluensulfonil hidrazonas, entre otros, con un enfoque que muestra al lector la gran versatilidad de reacciones en las cuales se encuentra involucrado el grupo Diazo bajo una perspectiva histórica que permite visualizar cómo ha evolucionado el estado del arte de este del grupo desde sus orígenes hasta nuestros días.Desde su descubrimiento hace más de 100 años, el grupo Diazo ha llamado considerablemente la atención de los químicos orgánicos debido a su gran versatilidad y al descubrimiento de un cúmulo de reacciones químicas asociadas a este grupo funcional. Con el transcurso del tiempo, la cantidad de reportes que detallan sus propiedades químicas se ha incrementado exponencialmente y han contribuido de manera fundamental en el desarrollo de la química de los carbenos y los carbenoides, a tal grado que los compuestos diazo constituyen la principal fuente utilizada para la generación de estos intermediarios reactivos. Curiosamente, el estudio de los compuestos diazo como grupo funcional se aborda de manera superficial en los cursos de Química Orgánica a nivel licenciatura, limitándose en el mejor de los casos al análisis de la reacción de Arndt-Eistert y la transposición de Wolff, implícita en esta transformación, así como las reacciones de esterificación empleando diazometano. Por tanto, la idea general que se plantea para los compuestos diazo no hace justicia al gran valor sintético que presenta esta clase de compuestos dentro de la Química Orgánica. El objetivo inicial que se pretende con este libro es mostrar la gran versatilidad de reacciones en 18 Erick Cuevas Yañez las cuales se encuentra involucrado el grupo diazo con una perspectiva histórica que permite visualizar cómo ha evolucionado el estado del arte del grupo diazo desde sus orígenes hasta nuestros días.Universidad Autónoma del Estado de México, UAEM

HIGH SUSCEPTIBILITY OF CANDIDA ALBICANS ATCC 10231 TO TETRAHYDROFURANOSYL-1,2,3-TRIAZOLES OBTAINED BY CLICK CHEMISTRY

Tetrahydrofuranosyl-1,2,3-triazoles, synthesized by Click chemistry, were tested as novel antifungal compounds. The results show a remarkable activity against Candida albicans ATCC 10231 expressed in a high MIC50 and MIC90 compared to traditional antifungals such as fluconazole