Oxirane
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Synthesis of Eugenol-Fluorinated Triazole Derivatives and Evaluation of Their Fungicidal Activity
Eugenol (C10H12O2, 4-allyl-2-methoxyphenol) is a phenolic natural product that has several biological activities and possibilities of applications. It is herein described the synthesis of eugenol-fluorinated triazole derivatives and evaluation of their fungicidal activity. The reaction of eugenol with epichlorohydrin resulted in the preparation of (±)-2-((4
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. EPOXIDATION OF JATROPHA METHYL ESTERS VIA ACIDIC ION EXCHANGE RESIN: OPTIMIZATION AND CHARACTERIZATION
Abstract Plant oils and their derivatives have been vigorously exploited as alternatives for synthesis of epoxides due to depletion of petroleum resources. In this study, crude jatropha oil (CJO) was subjected to a transesterification process to form jatropha methyl esters (JME) using peroxyacetic acid generated in situ from hydrogen peroxide and acetic acid
Braz. J. Chem. Eng.. Publicado em: 30/09/2019
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3. The Lubricity Analysis of Cutting Fluid Emulsions
The new generation of cutting fluids should have some characteristics, such as low toxicity and biodegradability. A bio-cutting fluid emulsion are an excellent option because they present those properties, as well as good mechanical performance. The present study aims to investigate the lubricity of O/W emulsions (cutting fluid emulsion), varying the concent
Mat. Res.. Publicado em: 2017
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4. SIMULTANEOUS DETERMINATION OF ORGANIC COMPOUND RESIDUES IN WATER SAMPLES BY DISPERSIVE LIQUIDLIQUID MICROEXTRACTION (DLLME) AND GC-(TQ)MS/MS / DETERMINAÇÃO DE RESÍDUOS DE COMPOSTOS ORGÂNICOS EM ÁGUA POR MICROEXTRAÇÃO LÍQUIDO-LÍQUIDO DISPERSIVA (DLLME) E GC-(TQ)MS/MS
The use of chemicals, which generates a lot off benefits, is responsible for the contamination of soil, water and foods. The concern about contamination of surface and ground water systems by pesticides has grown in scientific circles, especially by the presence of pesticides and other compounds in water sources. Thus, rapid analytical methods, sensitive and
Publicado em: 2010
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5. Study about the synthesis of autoregulators butyrolactones of the Streptomyces bacteria. / Estudos sobre a síntese de butirolactonas auto-reguladoras de bactérias Streptomyces.
Streptomycetes are Gram-positive filamentous bacteria well known for the ability to produce a wide variety of secondary metabolites and biologically active substances. These activities are controlled by low-molecular-weight compounds called butyrolactone autoregulators. The greater number of these compounds with autoregulators properties have as common chara
Publicado em: 2007
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6. Estudo Teórico de Complexos de Hidrogênio Heterocíclicos com Enfoque na determinação dos Mecanismos de Reação
Este trabalho trata da investigação teórica de propriedades moleculares dos seguintes compostos heterocíclicos: oxirana (C2H4O), metil-oxirana (H3C-C2H3O) e hidroxi-oxirana (HO-C2H3O), e dos respectivos mecanismos de reações referente à abertura destes anéis, frente à adição do ácido fluorídrico (HF). Neste contexto, foram determinadas as propri
Publicado em: 2006
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7. Sintese e caracterização de [Nb]-MCM-41 e NbxOy(OH)z-montmorilonita e aplicações em catalise redox e acida / Synthesis and characterization of [Nb]-MCM-41 and NbxOy(OH)z-montmorillonite and its applications in redox and acid catalysis
Nb-MCM-41 synthesis was optimized at room temperature varying the hydroxide, the silica and niobium sources and the order of addition of the niobium source. The materials, before and after the calcinations, were characterized by XRD and UV-Vis diffuse reflectance. The Nb-MCM-41 with best results was silylated and characterized by inductively coupled plasma o
Publicado em: 2005
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8. Alquilguanidinas imobilizadas em matrizes inorganicas
The preparation of novel base catalysts by the immobilisation of alkylguanidines in hydrophobic zeolite Y, hexagonal mesoporous silica MCM-41 and SiO2 sol-gel matrixes was studied. The encapsulated alkylguanidines were prepared by the reaction of primary amines with dicyclohexylcarbodiimide previously diffused into the zeolite. The anchoring of alkylguanidin
Publicado em: 1999
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9. Clerocidin alkylates DNA through its epoxide function: evidence for a fine tuned mechanism of action
Clerocidin (CL) is an effective topoisomerase II-poison, which has been shown to produce DNA depurination and strand breaks per se at the guanine (G) level. To elucidate the roles played by the different functional groups of CL in the reactivity towards nucleic acids, we investigated CL derivatives with key structural modifications. The derivatives were reac
Oxford University Press.
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10. Bacterial degradation of styrene involving a novel flavin adenine dinucleotide-dependent styrene monooxygenase.
By using styrene as the sole source of carbon and energy in concentrations of 10 to 500 microM, 14 strains of aerobic bacteria and two strains of fungi were isolated from various soil and water samples. In cell extracts of 11 of the bacterial isolates, a novel flavin adenine dinucleotide-requiring styrene monooxygenase activity that oxidized styrene to styre
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11. The solution structure of the Josephin domain of ataxin-3: Structural determinants for molecular recognition
The Josephin domain plays an important role in the cellular functions of ataxin-3, the protein responsible for the neurodegenerative Machado–Joseph disease. We have determined the solution structure of Josephin and shown that it belongs to the family of papain-like cysteine proteases, sharing the highest degree of structural similarity with bacterial staph
National Academy of Sciences.
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12. Thiol protease-specific inhibitor E-64 arrests human epidermoid carcinoma A431 cells at mitotic metaphase.
E-64-d (ethyl (2S, 3S)-3-[(S)-3-methyl-1-(3-methylbutylcarbamoyl) butylcarbamoyl]oxirane-2-carboxylate), a membrane-permeant derivative of the thiol protease-specific inhibitor E-64, was found to arrest human epidermoid carcinoma A431 cells at mitotic metaphase. This effect was dose-dependent with a threshold of 20 micrograms/ml in chemically defined culture