Organometallic Compounds
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. Surface modification of cellulose fibres
Several approaches to the modification of cellulose fibres are described, namely: (i) physical treatments such as corona or plasma treatments under different atmospheres; (ii) grafting with hydrophobic molecules using well-known sizing compounds; (iii) grafting with bi-functional molecules, leaving one of the functions available for further exploitation; and
Polímeros. Publicado em: 2005-06
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14. "One and two-photon induced birefringence in Salen dye cast films" / "Estudo da birrefringência fotoinduzida por um e dois fótons em compostos azoaromáticos da família salen".
In this work we present the one- and two-photon optically induced birefringence in cast films of amorphous poly(methyl methacrylate) (PMMA), containing a new series of organometallic azoaromatic compounds, referred to as Salen dyes, which may be used in optical storage applications. For the one-photon optically induced birefringence, longer writing times wer
Publicado em: 2005
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15. Novos aspectos e aplicações da química de teluranas e de teluretos orgânicos / New aspects and applications of the chemistry of organotelluranes and organic tellurides
The first part of this thesis deals with the study of the reactivity of electrophilic tellurium compounds, mainly tellurium tetrachloride and aromatic tellurium trichlorides. New aspects of the reactivity of TeCl4 towards alkynes and some acetophenones were disclosed. A mechanistic rationale for each of the processes studied was possible by the determination
Publicado em: 2005
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16. "Horizontes cimentados em Argissolos e Espodossolos dos tabuleiros costeiros e em Neossolos Regolíticos e Planossolos da depressão sertaneja no Nordeste do Brasil" / "Cemented Horizons in ultisol and spodosols from the coastal tablelands and in inceptisols and alfisols from the "sertaneja" depression of Northeast Brazil"
The present study was carried out in cemented horizons in Ultisols and Spodosols from the coastal tablelands, and in Inceptisols and Alfisols from the sertaneja depression of Northeast Brazil. The emphasis was concentrated on the cemented horizons developed in smooth depressions in the coastal tablelands. The main objective was to identify the cementing agen
Publicado em: 2004
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17. Sintese estereosseletiva do tamoxifeno, um agente antiestrogenico na terapia do cancer de mama
Tamoxifen is a non-steroidal antiestrogenic agent largely used in breast cancer therapy, particularly, in pacients with high risk to develop the disease after removal of the primary tumor. The structure of tamoxifen is relatively simple and could be reduced for synthetic purpose to a tetrasubstituted olefin. The (Z)-isomer (1) has antiestrogenic activity, wh
Publicado em: 2002
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18. Modeling and simulation of hydrodemetallation and hydrodesulfurization processes with transient catalytic efficiency
A model is presented for the description of the concentration behavior of organometallic and sulfurated compounds in hydrodemetallation and hydrodesulfurization catalytic processes, where catalyst effectiveness decreases with time. Due to the complexity of the mixture, an approach based on pseudocomponents was adopted. The system is modeled as an isothermal
Brazilian Journal of Chemical Engineering. Publicado em: 2000-06
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19. Estudos envolvendo a modificação e a interação do lapachol com compostos de metais de transição
This thesis is concerned with some studies of the natural compound 2-hidroxy-3(3-methyl-2-butenyl)-1,4-naphtoquinone, popularly known as lapachol. In Chapter I, a review is presented which includes the descriptions of procedures for the extraction of lapachol, its synthesis, physical, spectroscopic and structural properties, its biological activities, some o
Publicado em: 2000
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20. Reatividade de diazirinas e diaziridinas com compostos de paladio (II) em solventes proticos e aproticos
In this work, 3,3-pentamethylenediaziridine, N-methyl-3,3-pentamethylenediaziridine and N-cyclohexyl-3,3-pentamethylene diaziridine were prepared, as described in the literature. The coordination of these diaziridines with palladium(II) compounds was studied; these heterocycles react with bis-benzoni-trile-dichloropalladium(II), yielding air stable complexes
Publicado em: 1988
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21. IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man Volume 2 Some Inorganic and Organometallic Compounds
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22. In Vitro Antimalarial Activity of a New Organometallic Analog, Ferrocene-Chloroquine
The in vitro activities of new organometallic chloroquine analogs, based on 4-amino-quinoleine compounds bound to a molecule of ferrocene, were evaluated against chloroquine-susceptible, chloroquine-intermediate, and chloroquine-resistant, culture-adapted Plasmodium falciparum lineages by a proliferation test. One of the ferrocene analogs totally restored th
American Society for Microbiology.
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23. Characterization of an organometallic xenon complex using NMR and IR spectroscopy
Photolysis of Re(iPrCp)(CO)2(PF3) in liquid or supercritical Xe yields two new compounds [Re(iPrCp)(CO)2Xe and Re(iPrCp)(CO)(PF3)Xe]. Re(iPrCp)(CO)(PF3)Xe has been characterized by NMR and IR spectroscopies. The compound is an organometallic Xe complex that has been characterized by using NMR spectroscopy and is shown to be longer-lived than other organometa
National Academy of Sciences.
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24. Translocatable resistance to mercuric and phenylmercuric ions in soil bacteria.
Of a sample of 42 gram-negative Hg-resistant bacteria, three (a Pseudomonas fluorescens, a Klebsiella sp. and a Citrobacter sp.) contained translocatable elements conferring resistance to Hg2+ (all three) and to Hg2+ and phenylmercuric acetate (P. fluorescens). The discovery of transposable phenylmercuric acetate resistance extends the range of known resista