Aromatic Amines
Mostrando 13-24 de 74 artigos, teses e dissertações.
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13. Silica-supported quinolinium tribromide: a recoverable solid brominating reagent for regioselective monobromination of aromatic amines
Sintetizamos tribrometo de quinolina suportado em sílica, que mostrou ser um reagente de bromação eficiente, estável e reutilizável para a monobromação regiosseletiva de aminas aromáticas. Esse processo tem a vantagem de apresentar alto rendimento sob condições moderadas e usando procedimentos experimentais simples.
Journal of the Brazilian Chemical Society. Publicado em: 2010
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14. Interaction of SO2 with molecular and ionic species: Raman spectroscopy and theoretical calculations / Interação de SO2 com espécies iônicas e moleculares: espectrocopia raman e cálculos teóricos
In the present work molecular systems bearing the sulfur dioxide (SO2) as an electron acceptor species and several electron donor species as amines (aliphatic and aromatic), inorganic complexes and ionic liquids were investigated. Such complexes are commonly known as donor-acceptor complexes, and in particular, in the case of SO2 complexes are characterized
Publicado em: 2009
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15. Síntese de organo-seleno aminas e sua resolução cinética via reação de acetilação enantiosseletiva mediada por lipases / Synthesis of organoselenium amines and their kinetic resolution by enantioselective acetylation mediated by lipases
In this work, we have developed a chemoenzymatic method to enantiomerically synthesize enriched organoselenium amines (1-(2, 3 or 4 -(ethylselanyl)phenyl)ethanamine) and amides (N-(1-(2, 3 or 4-(ethylselanyl)phenyl)ethyl)acetamide). Initially, the organoselenium amines, in the racemic form, were synthesized from ortho-, meta- and para- aminoacetophenones. Th
Publicado em: 2008
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16. Sílica quimicamente modificada com os grupos p-anisidina, p-fenitidina e p-fenilenodiamina usada como adsorvente para Pb2+, Cu2+, Cd2+ e Ni2+ em soluções aquosa e etanólica
Silica gel was chemically modified with the aromatic amines p-anisidine, p-phenytidine and p-phenylenediamine, using grafting reactions. The resulting modified silicas were characterized by infrared spectroscopy and N2 adsorption/desorption isotherms. The organic groups were covalently immobilized in a monolayer form. These modified silicas were investigated
Química Nova. Publicado em: 2008
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17. Influencia dos polimorfismos T6235C e A4889G, do gene CYP1A1, e dos haplotipos NAT1*3, NAT1*4 e NAT1*10 do gene NAT1, associados com o metabolismo de carcinogenos, na susceptibilidade ao adenocarcinoma colorretal esporadico / Influence of T6235C and A4889G polymorphisms of the CYP1A1 gene, and NAT1*3, NAT1*4 and NAT1*10 haplotypes of the NAT1 gene, associated with the carcinogens metabolism, in the susceptibility of the sporadic colorectal adenocarcinoma
The exposure of the cells of the colon and rectum to carcinogenic substances is associated with the consumption of foods that are source of substrates, such as aromatic amines and polycyclic aromatic hydrocarbons. Enzymes such as cytochrome P450 monooxygenase, encoded by the CYP1A1 gene, and acetyltransferase, encoded by the NAT1 gene, are related to the met
Publicado em: 2008
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18. Avaliação e critérios de eficiência nos processos de tratamento de fluido de corte por eletroflotação / Evaluation criteri and efficiency in the procedures for treatment of fluid cutting by eletroflotation
In the machining process cutting fluids are used to facilitate the manufacture of metal parts, which has resulted in problems of various orders, ranging from the generation of harmful effects on the desktop to the aggression of the environment with their improper disposal. The cutting fluids are composed of oils and minerals, synthetic solutions and water, c
Publicado em: 2008
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19. Biotransformação de compostos funcionalizados por fungos basidiomicetos e desmetilação/desalquilação de aminas terciárias por fungos Aspergillus terreus / Biotransformation of Compounds Functionalized by Basiodiomycetes Fungi and Demethylation/dealkylation of Tertiary Amines by Aspergillus terreus.
In this work was considered the selectivity of reactions biocatalysted by basidiomycetes fungi with bifuncionalized compounds with ketone and selenide groups (1-2) or ketone and thio groups (3-4). The compounds 1-4 were prepared in according with methodologies from literature. During the synthesis of standard racemic β-hydroxyselenides 1a-4a and β-
Publicado em: 2007
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20. Uso do Blue Rayon para extração/concentração de compostos policíclicos em amostras ambientais
This is a review about the use of Blue rayon in the extraction and concentration of environmental contaminants in the aquatic environment. Blue rayon is an adsorbent composed of fibers covalently linked with copper phthalocyanine trisulphonate that has the ability to selectively adsorb polycyclic compounds. Blue rayon can be used in situ, in columns or in fl
Química Nova. Publicado em: 2006-06
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21. Intercalação de aminas em fenilfosfonatos e fenilarsonato metalicos lamelares : um enfoque termoquimico
The isostructural lamellar compounds titanium phenylphosphonate (FFT), titanium phenylarsonate (FAT) and zirconium phenylphosphonate (FFZ) were synthesized and intercalated with alkylmonoamines (methyl- to heptylamines), alkyldiamines (diaminoethane and diaminobuthane) and aromatic amines (lutidine and a-picoline). They were characterized through ele mental
Publicado em: 2004
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22. Avaliação e síntese de corantes fenotiazínicos para determinação espectrofotométrica de sulfeto e sulfito empregando sistemas de análise em fluxo.
In this work seven aromatic amines O e N-substituted were evaluated at optimized reaction conditions for symmetrics phenothiazinic dyes. DMPD, DEPD, PPD, PAP e PAA were the start reagent, where the yield for phenothiazinic dyes varying from 10% to 43% for different oxidizing (Fe3+ or ClO-), acids (H2SO4 or HBF4) and precipitant agent (ClO4 - or BF4 -). The l
Publicado em: 2004
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23. Adsorption of aromatic amino acids in a fixed bed column
Phenylalanine (Phe) and tyrosine (Tyr) are two of the twenty amino acids in proteins; they are classified as aromatic amino acids, because both have a benzene ring in their structures. These amino acids are important in the synthesis of several biologically active amines, such as beta-endorphin, a neurotransmitter. Amino acids can be separated by ion-exchang
Brazilian Journal of Chemical Engineering. Publicado em: 2003-09
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24. Componentes voláteis do café torrado. Parte II. Compostos alifáticos, alicíclicos e aromáticos
This review is about the aliphatic, alicyclic and aromatic compounds (non-heterocyclic compounds) that are present in the volatile fractions of roasted coffees. Herein, the contents, aroma precursors and the sensorial properties of volatile phenols, aldehydes, ketones, alcohols, ethers, hydrocarbons, carboxylic acids, anhydrides, esters, lactones, amines and
Química Nova. Publicado em: 2000-04