Abraham Rivera - Academia.edu (original) (raw)
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Papers by Abraham Rivera
Artecontexto Arte Cultura Nuevos Medios Art Culture New Media, 2011
Plastic and Reconstructive Surgery, 2004
Artecontexto Arte Cultura Nuevos Medios Art Culture New Media, 2010
Inorganica Chimica Acta, 2013
ABSTRACT One-pot synthesis of calixarene and hemicarcerand like compounds can be modulated by use... more ABSTRACT One-pot synthesis of calixarene and hemicarcerand like compounds can be modulated by use of mono- or bis-salicylaldehyde derivatives respectively, reacting with 3-aminophenylboronic acid. Thus, the first part of this work is focused on the synthesis of calix-like compounds derived from salicylaldehyde units including different substituents on the aromatic moiety. Seven different calix structures are described and their structural analysis has been carried out by spectroscopic techniques. The second part corresponds to the description of bis-salicylaldehyde derivatives, synthesis and reactivity towards the 3-aminophenylboronic acid leading to the formation of hemicarcerand-like compounds. Aliphatic and aromatic chains were inserted as linkers between the two salicylaldehyde units in order to evaluate the influence on the formation of the hemicarcerands compounds. Both, calixarene and hemicarcerand compounds resulted from condensation reactions, wherein the formation of N–B coordination bonds plays a significant role on the macrocyclization process.
Bioorganic & Medicinal Chemistry Letters, 2013
The aim of this study was to synthesize three nitro substituted chalcones and to evaluate their a... more The aim of this study was to synthesize three nitro substituted chalcones and to evaluate their antiinflammatory activity in the model of carrageenan induced edema in rats. The nitro chalcone were prepared by aldol condensation using of mechanical agitation and environmentally friendly solvents with 72-73% yields in approximately 2 h. The three structures were evaluated on biological activity at dose of 200 mg/kg and they showed anti-inflammatory protective effect by both oral and intraperitoneal administration, this effect was time dependent.
Acta Crystallographica Section E Structure Reports Online, 2013
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.045; wR... more Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.045; wR factor = 0.131; data-to-parameter ratio = 14.7. organic compounds o1694 Arias-Ruiz et al.
Las reacciones de oscurecimiento o de epardeamiento en los alimentos, son un grupo de mecanismos ... more Las reacciones de oscurecimiento o de epardeamiento en los alimentos, son un grupo de mecanismos muy importantes que generan el obscurecimiento, encafecimiento o empardeamiento de los alimentos. Se sintetizan colores que van desde un ligero amarillo hasta un café oscuro.
Una región es un término geográfico usado con una gran gama de significados, que en términos gene... more Una región es un término geográfico usado con una gran gama de significados, que en términos generales designa un área o extensión determinada de tierra más grande que las subregiones o subdivisiones que la constituyen, ya se trate de un continente como Europa, Asia, América, África, así como una parte de dicho continente (Europa Central o América del Sur), un país o conjunto de países, una cuenca, como la cuenca del Orinoco o del Danubio, una cordillera o región montañosa, etc., y mayor que un sitio específico.
Artecontexto Arte Cultura Nuevos Medios Art Culture New Media, 2011
Plastic and Reconstructive Surgery, 2004
Artecontexto Arte Cultura Nuevos Medios Art Culture New Media, 2010
Inorganica Chimica Acta, 2013
ABSTRACT One-pot synthesis of calixarene and hemicarcerand like compounds can be modulated by use... more ABSTRACT One-pot synthesis of calixarene and hemicarcerand like compounds can be modulated by use of mono- or bis-salicylaldehyde derivatives respectively, reacting with 3-aminophenylboronic acid. Thus, the first part of this work is focused on the synthesis of calix-like compounds derived from salicylaldehyde units including different substituents on the aromatic moiety. Seven different calix structures are described and their structural analysis has been carried out by spectroscopic techniques. The second part corresponds to the description of bis-salicylaldehyde derivatives, synthesis and reactivity towards the 3-aminophenylboronic acid leading to the formation of hemicarcerand-like compounds. Aliphatic and aromatic chains were inserted as linkers between the two salicylaldehyde units in order to evaluate the influence on the formation of the hemicarcerands compounds. Both, calixarene and hemicarcerand compounds resulted from condensation reactions, wherein the formation of N–B coordination bonds plays a significant role on the macrocyclization process.
Bioorganic & Medicinal Chemistry Letters, 2013
The aim of this study was to synthesize three nitro substituted chalcones and to evaluate their a... more The aim of this study was to synthesize three nitro substituted chalcones and to evaluate their antiinflammatory activity in the model of carrageenan induced edema in rats. The nitro chalcone were prepared by aldol condensation using of mechanical agitation and environmentally friendly solvents with 72-73% yields in approximately 2 h. The three structures were evaluated on biological activity at dose of 200 mg/kg and they showed anti-inflammatory protective effect by both oral and intraperitoneal administration, this effect was time dependent.
Acta Crystallographica Section E Structure Reports Online, 2013
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.045; wR... more Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.045; wR factor = 0.131; data-to-parameter ratio = 14.7. organic compounds o1694 Arias-Ruiz et al.
Las reacciones de oscurecimiento o de epardeamiento en los alimentos, son un grupo de mecanismos ... more Las reacciones de oscurecimiento o de epardeamiento en los alimentos, son un grupo de mecanismos muy importantes que generan el obscurecimiento, encafecimiento o empardeamiento de los alimentos. Se sintetizan colores que van desde un ligero amarillo hasta un café oscuro.
Una región es un término geográfico usado con una gran gama de significados, que en términos gene... more Una región es un término geográfico usado con una gran gama de significados, que en términos generales designa un área o extensión determinada de tierra más grande que las subregiones o subdivisiones que la constituyen, ya se trate de un continente como Europa, Asia, América, África, así como una parte de dicho continente (Europa Central o América del Sur), un país o conjunto de países, una cuenca, como la cuenca del Orinoco o del Danubio, una cordillera o región montañosa, etc., y mayor que un sitio específico.