3-ethoxycarbonyl-4-hydroxy-6-(methoxy-methoxy)-1-methyl-2-quinolone

In the title compound, C15H17NO6, the formation of an intramolecular O-H⋯O resonance-assisted hydrogen bond extends the delocalization of the electronic system beyond the two quinoline fused rings.Facultad de Ciencias Exacta

An Efficient Protocol for the Synthesis of Quinoxaline Derivatives at Room Temperature Using Recyclable Alumina-Supported Heteropolyoxometalates

We report a suitable quinoxaline synthesis using molybdophosphovanadates supported on commercial alumina cylinders as catalysts. These catalysts were prepared by incipient wetness impregnation. The catalytic test was performed under different reaction conditions in order to know the performance of the synthesized catalysts. The method shows high yields of quinoxaline derivatives under heterogeneous conditions. Quinoxaline formation was obtained using benzyl, o-phenylenediamine, and toluene as reaction solvent at room temperature. The CuH2PMo11VO40 supported on alumina showed higher activity in the tested reaction. Finally, various quinoxalines were prepared under mild conditions and with excellent yields

Relationships between Kováts Retention Indices and Molecular Descriptors of 1-(2-Hydroxy)-3-Arylpropane-1,3-Diones

Experimental and theoretical results for retention index of a set of 20 beta-diketones are given. The quantitative structure-chromatographic retention relationships (QSRR) theory is employed and six molecular descriptors are chosen to compute the fitting polynomials. Multiple regression analysis yields satisfactory results when one resorts to several variables equations, instead of computing just one-variable formulae. Average absolute deviations from experimental results are rather low, which seems to point out the suitability of the present approach

3-ethoxycarbonyl-4-hydroxy-6-(methoxy-methoxy)-1-methyl-2-quinolone

In the title compound, C15H17NO6, the formation of an intramolecular O-H⋯O resonance-assisted hydrogen bond extends the delocalization of the electronic system beyond the two quinoline fused rings.Facultad de Ciencias Exacta

Análisis de las opiniones vertidas en una escuesta por estudiantes de Ciencias Agrarias y Forestales, y su empleo en la autoevaluación de un curso de Química Orgánica

An analysis of the views of students majoring in Agronomy and Forest Engineering, poured into an institutional survey conducted between 2007-2011, was made in order to self-assess some of the teaching practices carried out in the Organic Chemistry course at Faculty of Agricultural and Forestry Sciences (UNLP). The students` opinions pointed to organizational, didactic, and evaluative aspects of the Course. Results are presented in graphics showing the students` appraisement about the cited topics. Growing criticism of theory-practice coordination and the organization of the class schedule organization according to the difficulty of each topic are matters of concern. An analysis of the results` evolution and a discussion was made, on possible causes of some views identified as negative.Se realizó un análisis de la opinión de estudiantes de las Carreras de Ingeniería Agronómica e Ingeniería Forestal vertida en una encuesta institucional realizada durante 2007-2011, con la finalidad de autoevaluar algunas de las prácticas docentes realizadas en el Curso de Química Orgánica de la Facultad de Ciencias Agrarias y Forestales (UNLP). Los estudiantes expresaron sus opiniones sobre aspectos organizativos, didácticos y evaluativos del Curso. Los resultados se presentan en gráficos que muestran la valoración de los alumnos sobre los aspectos citados. Requirentes de atención resultan, la creciente crítica a la coordinación teoría-trabajos prácticos, así como a la organización del cronograma de acuerdo a la dificultad de cada tema. Se analizó la evolución de los resultados y se discutió el posible origen de algunos aspectos identificados como negativos

A Simple and Mild Acylation of Alcohols, Phenols, Amines, and Thiols with a Reusable Heteropoly Acid Catalyst (H6P2W18O62·24 H2O)

The acylation of alcohols, phenols, thiols, and amines with varied substitution using acid anhydrides is efficiently catalyzed by Wells-Dawson heteropoly acid (H6P2W18O62·24 H2O). Reactions proceed with very good to excellent yield in air at room temperature, using toluene as solvent (40 examples). The bulk catalyst was easily reused without appreciable loss of its activity

Intramolecular resonance assisted hydrogen bond and aggregation of 2-quinolones: a neutron diffraction study

Intramolecular Resonance Assisted Hydrogen Bond and Aggregation of 2-Quinolones A Neutron Defraction StudyFil: Punte, Graciela Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaFil: Pozzi, G.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaFil: Goeta, A. E.. University Of Durham; Reino UnidoFil: Wilson, C.. Rutherford Appleton Laboratories; Reino UnidoFil: Romanelli, Gustavo Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Laboratorio de Estudio de Compuestos Orgánicos; ArgentinaFil: Autino, Juan Carlos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Laboratorio de Estudio de Compuestos Orgánicos; Argentin