Buscar
Itens para a visualização no momento 61-70 of 1660
Síntese de 4-organocalcogenil-1h-isocromen-1-iminas e 3-(alquil calcogenoil-2-benzofenil[b]selenofeno[2,3-d] calcogenofenos via reações de ciclização mediadas por sais de ferro
(Universidade Federal de Santa Maria, 2016-08-03)
In this work we developed the efficient and selective heterocyclic product synthesis
using as electrophilic agent a ferric chloride combinated with diorganyl
dichalcogenides under mild conditions. In the first part of this ...
Síntese, análise estrutural e avaliação da atividade catalítica mimética da superóxido dismutase e peroxidases de complexos derivados do piridoxal e cobre
(Universidade Federal de Santa Maria, 2016-03-31)
This work presents the synthesis and characterization of copper complexes
that mimic the activity of the superoxide dismutase enzyme, which operates in the
elimination of reactive oxygen species or in the activation of ...
Reações de β-enaminodicetonas com ncn dinucleófilos: obtenção de pirimidinas e sistemas heterocíclicos fundidos
(Universidade Federal de Santa Maria, 2016-08-26)
In this study the reactivity of β-enamino diketones [RC(O)C(=CHNMe2)C(O)CO2Et, R = C6H5, 4-Me-C6H4, 4-MeO-C6H4, 4-F-C6H4, 4-Br-C6H4, 4-NO2-C6H4, tien-2-il] with NCN bisnucleophiles as amidine and guanidine was investigated. ...
Polímeros fluorados anfifílicos para aplicação em diagnósticos por imagens de ressonância magnética
(Universidade Federal de Santa Maria, 2014-12-17)
The goal of this study is to present kinetic studies of (co)polymerization as well
as the synthesis and characterization of amphiphilic copolymers with a fluorinated
segment. Copolymers were obtained by RAFT (co)polymerizations ...
Voltametria adsortiva na determinação de traços e ultra-traços de Zr(IV), V(V),Ti(IV), Mo(VI), Hf(IV), Nb(V) e Ta(V) em águas naturais
(Universidade Federal de Santa Maria, 2014-03-13)
Single sensitive sequential AdSV methods were developed and optimized for the determination of trace zirconium, vanadium, titanium and molybdenum in river, estuary and seawater, independent of the salinity and content of ...
Desenvolvimento de dispositivo para extração e coleta de fumos de asfalto e aplicação na determinação de hidrocarbonetos policíclicos aromáticos
(Universidade Federal de Santa Maria, 2015-03-16)
The given work presents the development and usage of a device (DEC Device for Extraction and Collection) capable of generate and collect fumes produced by the heating of asphalt cement samples. The DEC was elaborated ...
Desemulsificação de petróleos assistida por ultrassom e posterior caracterização das fases água e óleo
(Universidade Federal de Santa Maria, 2011-08-19)
The effect of ultrasound (US) for demulsification of crude oils with different
characteristics (viscosity, density e water content) was investigated, without using
chemical demulsifier. Initially, the treatment using US ...
Síntese regiosseletiva de 2-metiltiopirimidin-4(3h)-onas N3-substituídas, uracilas derivadas e bromacil análogos
(Universidade Federal de Santa Maria, 2014-01-31)
A series of twenty-seven 3,6-disubstituted 2-methylthiopyrimidin-4(3H)-ones that have as substituents at 6 position of the pyrimidine ring the groups Me, Ph, 4-Me-C6H4, 4-OMe-C6H4, 4-F-C6H4, 4-Br-C6H4 and at 3 position the ...
Síntese de Seleno-Isoxazóis e Seleno-Indóis via Reações de Ciclização Intramolecular mediadas por Cloreto Férrico
(Universidade Federal de Santa Maria, 2013-03-05)
This work reports the synthesis of a series of 4-organoselenyl-isoxazoles (19 examples), prepared via FeCl3/diorganyl diselenides-promoted intramolecular cyclization of alkynone O-metyloximas. In general, the selenyl-isoxazoles ...
Síntese de Calcogenofenos e Isoquinolinas via Reações de Ciclização Intramolecular
(Universidade Federal de Santa Maria, 2013-11-26)
In the first part of this work, a series of selenophenes and tellurophenes were prepared starting from of (Z)-chalcogenoenynes, by employing FeCl3 diorganyl dichalcogenide-mediated intramolecular cyclization. In general, ...