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Síntese de compostos contendo núcleos de pirimidínicos derivados de β-enaminodicetonas
(Universidade Federal de Santa Maria, 2019-03-22)
In this work the reactivity of β-enaminodiketones [RC(O)C(=CHNMe2)C(O)R1], (wher R= C6H5, 4-Me-C6H4, 4-OMe-C6H4, 4-Cl-C6H4 4-NO2-C6H4, thien-2-yl and furan-2-yl) and R1 (CF3 and CO2Et), was studied with dinucleophiles such ...
Avaliação das condições de extração para posterior especiação de arsênio em alimentos por LC-ICP-MS
(Universidade Federal de Santa Maria, 2019-07-29)
Arsenic is a toxic element with carcinogenic and mutagenic characteristics. However,
its toxicity is associated with their species, because some present different toxicities.
In this sense, speciation analysis is mandatory ...
Métodos analíticos para identificação e quantificação de espécies salinas e sedimentos em petróleo
(Universidade Federal de Santa Maria, 2019-07-18)
In this work, the ASTM D 4807 standard method combined with scanning electron microscopy (SEM) was used and evaluated for the identification of the morphology and composition of saline species present in sediments isolated ...
Formação da ligação carbono-carbono envolvendo organocalcogênios catalisada por metais de transição
(Universidade Federal de Santa Maria, 2019-02-22)
In this thesis we developed a methodology for carbon-carbon bond formation via a cross-coupling reaction between classical nucleophiles and organoselenium electrophiles catalyzed by transition metals. The fact that ...
Síntese de derivados de selenofenos e 4H-selenocromeno via reações de ciclização eletrofílica
(Universidade Federal de Santa Maria, 2019-07-26)
This work reports the synthesis of a series of selenium heterocyclics containing in it’s
core structure. These compounds are obtained through intramolecular electrophilic
cyclization reactions of alkynyl substrates and ...
Ciclização eletrofílica intramolecular de (Z)-calcogenoeninos: síntese e reatividade de calcogenofenos e (Z)-calcogenetos vinilicos
(Universidade Federal de Santa Maria, 2019-02-22)
In the present thesis, efficient methods were developed to the synthesis of a series of heterocycles by electrophilic cyclization of (Z)-chalcogenoenynes 1, and chalcogenophenes 2, mediated by species of I2 and/or RSeBr. ...