Cyclohexanone
Mostrando 1-12 de 41 artigos, teses e dissertações.
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1. Ketones as Electrophile in Nitroaldol Reaction: Synthesis of β,β-Disubstituted- 1,3-dinitroalkanes and Allylic Nitro Compounds
Abstract β,β-Disubstituted-1,3-dinitro compounds were obtained exclusively with an overall yield of 83% through a domino nitroaldol/elimination/1,4-addition process, when excess nitromethane was added to cyclohexanone or butanone using DBU (1,8-diazabicyclo[5.4.0]undec-7-ene), as a basic catalyst. On the other hand, β-nitroalcohols could be obtained in 30
J. Braz. Chem. Soc.. Publicado em: 2021-08
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2. OXIDATION OF CYCLOHEXANOL ON PHOSPHOTUNGSTIC ACID ANION INTERCALATED LAYERED DOUBLE HYDROXIDES WITH AQUEOUS H2O2 AS OXIDANT
The layered double hydroxides (LDH) of Mg2AlNi and Mg3Al pillared by Keggin-type phosphotungstic acid anion (POM), i.e. Mg2AlNi-POM LDH and Mg3Al-POM LDH were synthesized by an ion-exchange method. The synthesized POM intercalated LDH compounds were characterized using various techniques such as FTIR, XRD, TGA and BET. The observed results show that the obta
Quím. Nova. Publicado em: 2018-01
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3. Optimization of Reaction Conditions for Cyclohexane to Cyclohexanone with t-Butylhydroperoxide Over CuCl2 Loaded with Activated Carbon
Catalytic oxidation of hydrocarbons can be performed efficiently in the presence of tert- butylhydroperoxide (TBHP) under a low-valent transition metal as the catalyst. CuCl2 loaded with activated carbon had synthesized and characterized by X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX), and then utilized as a catalyst for the oxidati
J. Braz. Chem. Soc.. Publicado em: 2016-01
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4. Production and characterization of an extracellular lipase from Candida guilliermondii
Extracellular lipases from the endophytic yeast Candida guilliermondii isolated from castor leaves (Ricinus communis L.) were produced using low-cost raw materials such as agro-industrial residues and applying them in the esterification of oleic acid for evaluating their potential use in biodiesel production. After partial purification using ammonium sulfate
Braz. J. Microbiol.. Publicado em: 2014-12
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5. Desenvolvimento, caracterização e aplicação eletroanalítica de um compósito fluido de adesivo epóxi, grafite e ciclo-hexanona
A fluid conducting composite material prepared from graphite powder, commercial epoxy resin Araldite®, and cyclohexanone has been developed. The composition was optimized considering the mechanical properties as conductivity and adhesiveness using response surface methodology. This work employed cyclic voltammetry and amperometry to investigate the characte
Química Nova. Publicado em: 2010
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6. SPME-GC-FID method development for analyzing cyclohexanone hydrogenation products
Este trabalho apresenta o desenvolvimento de um método simples, rápido e preciso para análise dos produtos da hidrogenação eletrocatalítica da ciclohexanona com a técnica de microextração em fase sólida, usando cromatografia a gás com detector de ionização por chama. A otimização preliminar do método foi realizada através de ferramentas quim
Journal of the Brazilian Chemical Society. Publicado em: 2009
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7. AplicaÃÃes de reagentes quirais de enxofre em catÃlise assimÃtrica e na sÃntese estereosseletiva de cetonas cÃclicas substituÃdas
This thesis describes the development of new methodologies for the use of chiral sulfur compounds, exploring their ability to transfer chiral information. The first methodology was based on the stereoselective transfer of ligands to α,β- unsaturated ketones mediated by organocuprates in a Michael addition reaction using (SR)- methyl-p-tolyl-sulfoxi
Publicado em: 2008
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8. Studies on facial diastereoselectivity in Diels-Alder reactions of sulfinyl benzoquinones and in nucleophilic additions to sulfanylated sulfinylcyclohexanones / Estudos de diastereosseletividade facial em reações de Diels-Alder de sulfinil benzoquinonas e em adições nucleofílicas a sulfinil cicloexanonas sulfaniladas
Calcando-se na bem conhecida capacidade que os sulfóxidos apresentam em induzir a quiralidade em uma vasta gama de reações, foram preparadas as (±)-2-p-tolilsulfinil-3,6-dimetil- e a (S)-2-p-tolilsulfinil-3-metil-1,4-benzoquinonas e estudadas as suas reações de Diels-Alder com alguns 1,3-dienos. Bons resultados de quimio- e regiosseletividade foram obt
Publicado em: 2008
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9. Oxidação Baeyer-Villiger de cicloexanona com peroxido de hidrogenio catalisada por alumina / Alumina-catalyzed-Villiger oxidation of cyclohexanone with hydrogen peroxide
Two aluminas, one comercial (Fluka) and the other obtained by sol-gel methods, were used as catalysts for the Baeyer-Villiger oxidation using cyclohexanone as substrate and hydrogen peroxide as oxidant. The catalysts were characterized by X-ray diffraction and thermogravimetric analysis and the oxidation products were analysed by gas chromatography and H and
Publicado em: 2007
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10. Multibiorreações e suas aplicações para as sinteses de compostos enantiomericamente puros / Multibioreactions applied to the syntheses of enantiomerically pure compounds
The utilization of enzymes for organic compound transformations is an alternative to classical syntheses. Enzymes are used as biocatalysts for the syntheses in vitro of asymmetric compounds because they are intrinsically chiral and result in high catalytic efficiency. In front of the biodiversity of existing microorganisms in Nature and of the necessity to d
Publicado em: 2006
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11. Compostos carbonílicos no ar em ambientes de trabalho de carvoarias na Bahia.
The goals of the present work were: to present an analytical methodology applicable to the determination of carbonyl compounds (CC) in vapor phase, in area and personal samples collected in charcoal company workplaces; to determine the CC profile in air inhaled by charcoal workers; and to quantify the CC in vapor phase in air of workplaces and breathing zone
Publicado em: 2005
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12. "Oxidação do cicloexeno a cicloexanona pelo Processo Wacker"
Cyclohexanone is an important industrial intermediate which is normally obtained together with cyclohexanol by cyclohexane oxidation using homogeneous cobalt catalysts. The conversion is limited to 4% in order to keep the selectivity high. In this work, we studied the synthesis of cyclohexanone by Wacker oxidation of cyclohexene using the chloride ion- free
Publicado em: 2004