Nitration
Mostrando 1-12 de 91 artigos, teses e dissertações.
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1. Liquid Phase Nitration of Benzene Catalyzed by a Novel Salt of Molybdovanadophosphoric Heteropolyacid
A highly efficient and reusable catalyst QA-HPMV was successfully prepared by the reaction of quinoline-2-formic acid (QA) with molybdovanadophosphoric heteropolyacid (H4PMo11VO40, HPMV) for the nitration of benzene. The physical and chemical properties of the sample was characterized by X-ray diffraction analysis (XRD), Fourier transform infrared spectrosco
J. Braz. Chem. Soc.. Publicado em: 2021-06
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2. Experimental studies of CO2 absorption enhancement in water-based nanofluids of carbon nanotubes
Abstract The improvement of CO2 absorption by CNT nanofluids with deionized water as the base fluid was studied experimentally. The reactor used was a stirred thermostatic reactor, operated batchwise. Pure CO2 was employed in all the experiments. The content of CNTs in the nanofluids ranged from 0 to 0.2% (wt). The acidification treatment of CNTs was employe
Braz. J. Chem. Eng.. Publicado em: 2017-04
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3. Efeito da ativação química nas propriedades de superfície de xisto retortado
A pyrolyzed oil shale by-product known as retorted shale was functionalized with HCl, HNO3, H2SO4, H3PO4, HNO3/H2SO4 (3:1), Fenton's reagent, (NH4)2S2O7, NaOH, and KMnO4 using either ultrasound (Route 1) or reflux (Route 2). The products obtained were evaluated in terms of cation exchange capacity (CEC). Structural characterization was performed using X-ray
Quím. Nova. Publicado em: 2016-05
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4. Risk Assessment for Hexamine Nitration into RDX
ABSTRACT: Explosives are widely used in extraction of ores, melts and fuels and in the safe and economical demolition of structures. These applications demonstrate the value of explosives to society and the reason why they are manufactured worldwide despite the hazard of their preparation. Hence, this paper focuses on the manufactory of the military explosiv
J. Aerosp. Technol. Manag.. Publicado em: 2014-12
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5. Identificação de alvos protéicos com potencial diagnóstico e prognóstico em doença arterial coronária / Identification of protein targets with potential diagnostic and prognostic in coronary artery disease
Worldwide, millions of patients are treated in emergencies because they had acute-onset chest pain, but only a portion is due to coronary syndrome. In situations like this is extremely important to distinguish when the chest pain is due to myocardial ischemia, as this is high risk and initiation of treatment should be immediate. New biomarkers are needed to
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/06/2012
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6. Assessment of the synthesis routes conditions for obtaining ammonium dinitramide by the FT-IR
Abstract Over the last two decades, many routes have been proposed to synthesize ammonium dinitramide (ADN). However, most of them lie in routes in which reactants are too expensive for large-scale production. In this sense, the use of ordinary reactants is of paramount importance in this case. The aim in this synthesis consists on nitrating a starting react
J. Aerosp. Technol. Manag.. Publicado em: 2011-12
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7. O uso de aparelhos de micro-ondas domésticos em aulas experimentais de química orgânica: nitração de salicilaldeído
The use of microwave in chemistry has known benefits over conventional heating methods, e.g. reduced reaction times, chemical yield improvement and the possibility if reducing or eliminating the use of organic solvents. We describe herein a procedure for the nitration of salicylaldehyde in water using a domestic microwave oven, which can be used as an experi
Química Nova. Publicado em: 2010
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8. Antioxidant capacity of eugenol derivatives
Toxicity and antioxidant capacity of eugenol derivatives (E2 = 2-Methoxy-4-[1-propenylphenyl]acetate, E3 = 4-Allyl-2-methoxyphenylacetate, E4 = 4-Allyl-2-methoxy-4-nitrophenol, E5 = 5-Allyl-3-nitrobenzene-1,2-diol, E6 = 4-Allyl-2-methoxy-5-nitrophenyl acetate) were evaluated in order to determine the influence of the sustituents. E2-E6 were synthesized from
Química Nova. Publicado em: 2009
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9. Oxidação e nitração de proteínas mediadas por peroxinitrito e peroxidases. Mecanismos, inibição por tempol e implicações patofisiológicas / Oxidation and nitration of proteins by peroxynitrite and peroxidases. Mechanisms, tempol inhibition and patophysiological implications
The oxidants derived from peroxynitrite and peroxidase enzymes, such as myeloperoxidase (MPO), and the lesions they promote in proteins are being extensively investigated because of their relevance in inflammatory processes. Here, the proteins RNase and lysozyme were employed as targets of oxidations/nitrations mediated by peroxynitrite and MPO/H
Publicado em: 2008
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10. Síntese de novos naftoimidazóis derivados de β-lapachona e compostos relacionados, empregando irradiação na região de microondas e reagentes suportados, e outras sínteses. / Synthsis of new naphthoimidazole derivatives from β-lapachona and related compounds, using irradiation on microwaves region and supported reagents, and other synthesis.
In this work it was investigeted the use of microwaves and supported reagents to the synthesis of β-lapachone, nor-β-apachone and β-lapachone-3-sulfonic acid naphthoimidazole derivatives. The purpose was to develop a methodology in agreement with the environmental exigencies, by the reduction of solvents use, more efficient energy transfer pro
Publicado em: 2008
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11. Estudo da inibição do oxido nitrico sobre funções de eosinofilos humanos estimulados com eotaxina e RANTES in vitro / Study of nitric oxide inhibition in human eosinophil functions stimulated in vitro with eotaxin and RANTES
Eosinophils participate in the pathogenesis of many inflammatory diseases, including parasitic infections and allergic diseases. Of the allergic diseases, asthma is characterized by eosinophilia. Currently, asthma affects 300 million people in world, and is an important public health problem. Asthma is an inflammatory chronic disease that involves interactio
Publicado em: 2008
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12. Síntese de bisporfirinas contendo o espaçador 2,2-bipiridina: modelos na elaboração de sensores luminescentes de íons metálicos / Synthesis of bisporphyrins held together by the 2,2-bipyridine spacer: models in the elaboration of luminescent sensors for metal ions
In this work have been synthesized bisporphyrins held together by means of amide linkage at the 4,4position of 2,2-bipyridine, reacting the mono-functionalised aminophenyl-porphyrin (NH2PTriPP) and 4,4-diacid chloride bipyridine (DACBipy). A preliminary study was conducted for the establishment of the reaction conditions for the attainment of mono(nitropheny
Publicado em: 2008