Sulfoxides
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Synthesis and Antioxidant and Antimicrobial Properties of β-Hydroxy Sulfides, Sulfoxides, and Sulfones Derived from Cardanol and Glycerol Derivatives
Natural and synthetic sulfur-bearing organic compounds have many applications in medicinal chemistry. This article reports the preparation of amphiphilic β-hydroxy sulfides, sulfoxides, and sulfones derived from cardanol and glycerol. Thiolysis of cardanol epoxide 3 with various thiols (4a-4j) in ethanol or water yielded the corresponding β-hydroxy sulfide
J. Braz. Chem. Soc.. Publicado em: 2020-12
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2. Enzymatic potential of heterotrophic bacteria from a neutral copper mine drainage
Abstract Copper mine drainages are restricted environments that have been overlooked as sources of new biocatalysts for bioremediation and organic syntheses. Therefore, this study aimed to determine the enzymatic activities (esterase, epoxide hydrolase and monooxygenase) of 56 heterotrophic bacteria isolated from a neutral copper mine drainage (Sossego Mine,
Braz. J. Microbiol.. Publicado em: 2016-12
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3. Metal-free catalytic oxidation of sulfides to sulfoxides with ammonium nitrate, ammonium hydrogen sulfate and ammonium bromide as catalyst
A oxidação catalítica geral e sem o uso de metais, de sulfetos alifáticos e aromáticos aos seus sulfóxidos correspondentes via combinação de nitrato de amônio (NH4NO3), hidrogenossulfato de amônio suportado em sílica gel (NH4HSO4-SiO2) e uma quantidade catalítica de brometo de amônio (NH4Br) na presença de SiO2 aquoso (50%, m/m) foi investigada
Journal of the Brazilian Chemical Society. Publicado em: 2010
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4. Degradação de poliestirenossulfonato de sódio fotossensibilizada pelo corante QTX / Degradation of poly(styrenesulfonate) photosensitised by QTX dye
The poly(styrenesulfonate) (PSS) photosensitised by 2-hydroxy-3-(3,4-dimethyl-9-oxo-9H-thioxanthen-2-yloxy)-N,N,N-trimethyl-1-propanium chloride (QTX) solution degradation mechanism was investigated. Initially, the photodegradation of QTX in aqueous solution was studied. The photoproducts generated photolysis were characterized as being sulfones and sulfoxid
Publicado em: 2009
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5. Estudo termodinamico do equilibrio liquido-liquido visando a remoção do enxofre do oleo diesel com liquidos ionicos / Thermodynamic study of liquid-liquid equilibrium aiming sulfur removal by using ionic liquids
The sulfur contaminants more difficult to remove from diesel oil by hydrodesulfuration process (HDS) are the sterically hindered aromatic compounds, like dibenzothiophene (DBT), and its alkylated derivatives 4-methyl-dibenzothiophene (4-MDBT) and 4,6-dimethyl-dibenzothiophene (4,6-DMDBT), commonly called DBTs. Increasing the number of methyl groups attached
Publicado em: 2009
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6. Estudo da oxidação de sulfetos pró-quirais com oxo diperoxo complexos de molibdênio (VI) / Oxidation study of prochiral sulfides with oxo diperoxo Molybdenum (vi) complexes
This study describes the use of oxo diperoxo molybdenum (VI) complex using 2,2-bipyridine and N,N-dioxide-2,2-bipyridine as ligands for the oxidation of a series of aliphatic and aromatic sulfides, ketosulfides, sulfinyl acids and olefinic sulfides. The preparation of these complexes, the reactivity and the chemeoselectivity in these sulfides oxidation react
Publicado em: 2007
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7. Conformational analysis and electronic interaction study of some ortho-substituted alpha-ethylsulfonylacetophenones; and the oxidative rearrangement study of some ortho-substituted alpha-ethylthioacetophenones / Análise conformacional e estudo das interações eletrônicas em alfa-etilsulfonilacetofenonas-orto-substituídas e o estudo do rearranjo oxidativo de alfa-etiltioacetofenonas-orto-substituídas
The first part of this thesis reports the conformational study of some -ortho-substituted α-ethylsulfonylacetophenones o-X-PhC(O)CH2SO2Et (X= OMe 1, Me 2, F 3, Cl 4, Br 5 e NO2 6) through the analysis of the carbonyl stretching IR band in solvents of increasing polarity supported by HF/6-31G** ab initio computations. The good match between IR frequencie
Publicado em: 2005
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8. Complexos de dibenzoilmetanatos de terras raras com ligantes R2S=O utilizados como emissores em dispositivos eletroluminescentes / Rare earth complexes with dibenzoylmethanate and R2S=O ligands used as emitting layer in electroluminescent devices
Este trabalho apresenta a síntese e os estudos foto e eletroluminescentes dos complexos de β-dicetonatos (dibenzoilmetanato -DBM) de terras raras trivalentes (TR=Eu3+, Sm3+ e Gd3+) hidratados e contendo ligantes sulfóxidos (L= dibenzilsulfóxido - DBSO, dimetisulfóxido - DMSO, difenilsulfóxido - DPSO e p-toluilsulfóxido - PTSO). Os complexos obtido
Publicado em: 2004
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9. Estrutura e reatividade de sulfóxidos de rutênio com bases heterocíclicas nitrogenadas / Structure and reactivity of ruthenium sulfoxides containing nitrogen heterocyclic bases
Ruthenium(II) sulfoxides are compounds of great interest in oxidative catalysis and in chemotherapy. In order to contribute for the understanding of the chemistry and electronic structure of this class of compounds, it has been studied a series of [RuCl2(S-dmso)2Lx] complexes, where x = 1 (polymeric compounds) or 2 (monomers) and L = N-heterocyclic ligands (
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/11/1990
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10. Methionine Limitation in Escherichia coli K-12 by Growth on the Sulfoxides of d-Methionine
The synthesis and resolution of the diastereoisomers of d-methionine sulfoxide in high yield is described. Growth of two methionine auxotrophs (strains HfrC and AB1932) on the d-methionine sulfoxides is slower than on l-methionine, and the resultant cells are markedly derepressed for three enzymes of the methionine regulon (cystathionine synthetase, cystathi
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11. Microbially Mediated Formation of Benzonaphthothiophenes from Benzo[b]thiophenes
Studies of the microbial metabolism of benzo[b]thiophene (molecular weight 134) by three Pseudomonas isolates showed the formation of benzothiophene sulfoxide, benzothiophene sulfone, and a sulfur-containing metabolite with a molecular weight of 234. Desulfurization of the high-molecular-weight product with nickel boride gave 1-phenylnaphthalene, indicating
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12. Inhibition of Ammonia Oxidation in Nitrosomonas europaea by Sulfur Compounds: Thioethers Are Oxidized to Sulfoxides by Ammonia Monooxygenase
Organic sulfur compounds are well-known nitrification inhibitors. The inhibitory effects of dimethylsulfide, dimethyldisulfide, and ethanethiol on ammonia oxidation by Nitrosomonas europaea were examined. Both dimethylsulfide and dimethyldisulfide were weak inhibitors of ammonia oxidation and exhibited inhibitory characteristics typical of substrates for amm