Aldol Condensation
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. A Facile Synthesis of Novel Isatinspirooxazine Derivatives and Potential in vitro Anti-Proliferative Activity
Novel isatinspirooxazine derivatives were designed and synthesized as potential anti-proliferative agents. The new compounds were obtained from aldol condensation reactions between isatin and 3-(hydroxyimino)butan-2-one in the presence of an organic base in order to generate an aldol adduct, followed by cyclization in trifluoroacetic acid, providing the desi
J. Braz. Chem. Soc.. Publicado em: 2019-01
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2. CONDENSAÇÃO ALDÓLICA DE FURFURAL E ACETONA CATALISADA POR BASES ORGÂNICAS NITROGENADAS: UM ESTUDO PRELIMINAR DE DESEMPENHO CATALÍTICO VISANDO A PRODUÇÃO DE BIOQUEROSENE DE AVIAÇÃO
The aldol condensation between furfural and acetone was studied in the presence of organic bases, such as Piperazine (PIP), 3-Aminopropyltriethoxysilane (APTES) and 1,5,7-Triazabicyclo [4.4.0] dec-5-ene (TBD), as basic catalysts. The latter base showed the highest conversion rates of furfural and high selectivity to the single-condensation product 4-(2-Furyl
Quím. Nova. Publicado em: 2018-06
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3. Molecular And 3D-Structural Characterization Of Fructose-1,6-Bisphosphate Aldolase Derived From Metroxylon Sagu
ABSTRACT Fructose-1,6-bisphosphate aldolase (FBAld) is an enzyme that catalyzes the cleavage of D-fructose-1,6-phosphate (FBP) to D-glyceraldehyde-3-phosphate (G3P) and dihydroxyacetone phosphate (DHAP), and plays vital role in glycolysis and gluconeogenesis. However, molecular characterization and functional roles of FBAld remain unknown in sago palm. Here
Braz. arch. biol. technol.. Publicado em: 22/06/2017
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4. Síntese de fotoprotetores e sua imobilização em poli(metacrilato de metilo): um projeto integrado de química orgânica, química de polímeros e fotoquímica
Dibenzalacetone and other aldol condensation products are known sunscreens commonly used in cosmetics. This type of compounds can easily be prepared in an Organic Chemistry Lab by reaction of aldehydes with ketones in basic medium. These compounds can be incorporated in poly(methyl methacrylate) and used as UV light absorbers, for example in sunglasses. This
Química Nova. Publicado em: 2010
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5. Estudos metodológicos visando a síntese da biotina a partir da hidantoína
Biotin (1), a member of the vitamin B complex group, has been an attractive synthetic target due to its biological activity and its applications in different fields such as immunology, radiotherapy and bioanalytical chemistry. In this thesis we report some experimental results for an alternative biotin synthesis, using hydantoin (146) as starting material. T
Publicado em: 2008
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6. Síntese e investigação de atividades biológicas de diidro-piran-2,4-dionas.
This work presents synthesis of seven dihydro-pyran-2,4-diones and investigation of some of its biological activities (moluscicidal, antiulcer, antioxidant and anticholinesterasic). These compounds were prepared - in yields that had varied of moderate to good (50 - 85%) - through the aldol condensation of -ketoesters diânion with an aldehyde or a ke
Publicado em: 2007
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7. Preparação e caracterização de hidrotalcitas Mg/AL calcinadas e suas propriedades cataliticas para reações de conversão de etanol / Preparation and characterization of calcined Mg/AL-Hydrotalcite and ethanol catalytic properties
Materiais do tipo hidrotalcita foram sintetizados, calcinados e caracterizados, assim como utilizados na conversão catalítica de etanol. As sínteses foram realizadas com razões molares AI/(AI + Mg) iguais a 0,20; 0,25 e 0,33; em todos os casos os difratogramas de raios-X demonstraram que, efetivamente, fases de hidrotalcitas tinham sido obtidas. Esses ma
Publicado em: 2005
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8. Silica sulfuric acid as an efficient and reusable reagent for crossed-aldol condensation of ketones with aromatic aldehydes under solvent-free conditions
Aldeídos aromáticos sofrem condensação aldólica cruzada com cetonas, na presença de sílica-ácido sulfúrico, na ausência de solventes, tendo como produto o a, b aldólico insaturado correspondente, com excelente rendimento. O reagente pode ser reutilizado diversas vezes sem perda do rendimento da reação.
Journal of the Brazilian Chemical Society. Publicado em: 2004-10
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9. Influence of thermal treatments on the basic and catalytic properties of Mg,Al-mixed oxides derived from hydrotalcites
This work studied the influence of calcination conditions on basic properties and catalytic performance of Mg,Al-mixed oxides derived from a hydrotalcite sample (Al/(Al+Mg)=0.20). Various heating rates, calcination atmospheres and lengths of calcination at 723K were evaluated. TPD of CO2 and retroaldolization of diacetone alcohol (DAA) were used to determine
Brazilian Journal of Chemical Engineering. Publicado em: 2004-06
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10. Efeito da substituição por átomos de flúor no equilíbrio conformacional de chalcona
Chalcone (1) and its fluorinated derivatives 2-4, as well as their cyclic analogues 5-10, were synthesized through an aldol condensation reaction between the corresponding ketone and aldehyde. These compounds were characterized by IR, EIMS and ¹H and 13C NMR spectral data. Modern NMR techniques allowed us to conclude that the compounds obtained show E confi
Química Nova. Publicado em: 2001-10
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11. Sintese total e estereosseletiva do (+-)-invictolideo. Componente do feromonio de reconhecimento da formiga Solenopsis invicta
Invictolide (1), a component of the queen recognition pheromone of Solenopsis invicta (imported fire ant) has been synthesized through three different routes, the relative stereochemistry at C(5), C(6) and C(1 ) being established using stereoselective aldols condensations (Scheme LXVIII). Route A required eight steps (24% overall yield) starting with the add
Publicado em: 1991
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12. THE ENZYMATIC SYNTHESIS OF FATTY ACIDS BY ALDOL CONDENSATION