Buscar
Itens para a visualização no momento 511-520 of 905
Síntese de 3-(organocalcogenil)-imidazotiazinas e funcionalização de inamidas via reações de ciclização, clorosselenação e tosilação promovidas por cloreto férrico e ácido p-toluilssulfônico
(Universidade Federal de Santa Maria, 2022-02-21)
In this thesis, four synthetic protocols were developed for the synthesis of four new classes of compounds, including the synthesis of 3-(organocalalcogenyl)-benzoimidazothiazines, 4-(organocalalcogenyl)-oxazolones, vinyl ...
Hidrotiolação regio e estereosseletiva de sistemas diínos: síntese e reatividade de (Z)-tioeninos
(Universidade Federal de Santa Maria, 2022-03-10)
Sulfur compounds are important building blocks in Organic Chemistry. The class of vinyl sulfides stands out for its versatility and applicability in the synthesis of new structures. Due to the relevance of these compounds, ...
Determinação voltamétrica de tiofenos e sulfetos em matrizes asfálticas empregando eletrodo de ouro em meio não aquoso
(Universidade Federal de Santa Maria, 2016-02-25)
The sulfur compounds have been studied for many years due to their importance in
chemical, biological and industrial areas. These compounds can also be found in
matrices of oil and its derivatives, and among the groups, ...
Síntese e propriedades fotofísicas de 2-(5-aril-4,5-diidro-1H-1-fenilpirazol-3-il) fenóis e sistemas pirazolil-triazólicos derivados
(Universidade Federal de Santa Maria, 2021-11-26)
The present work describes the synthesis, structural study and evaluation of the photophysical properties of a series of eight 1,3,5-triaryl-substituted 2-pyrazolin derivatives, as well as their application in obtaining a ...
Determinação de cloreto em petróleo por espectrometria de absorção molecular de alta resolução com forno de grafite e fonte contínua
(Universidade Federal de Santa Maria, 2015-07-14)
In this work some procedures were proposed in order to enable the determination of
chlorine in petroleum by using high resolution continuum source graphite furnace and
molecular absorption spectrometry (HR-GF-MAS). ...
Extração, composição química e avaliação das atividades de inibição enzimática e antimicrobiana de Leonurus sibiricus L.
(Universidade Federal de Santa Maria, 2016-02-25)
In this study, methanolic and acid methanolic extracts were prepared from the aerial parts of Leonurus sibiricus L. and six secondary metabolites were isolated: the triterpene squalene (28), the labdane-type diterpenoid ...
Avaliação de métodos de preparo de amostras para a determinação de halogênios em plantas medicinais
(Universidade Federal de Santa Maria, 2015-07-21)
In this work, four sample preparation methods were evaluated for further determination of halogens (F, Cl, Br e I) in medicinal plants. The evaluated sample preparation methods were microwave-induced combustion (MIC), ...
Rotâmeros de [2]rotaxanos: estudo do efeito do macrociclo sobre o eixo molecular
(Universidade Federal de Santa Maria, 2017-07-20)
This work presents the synthesis of three new threads and three new [2]rotaxanes models that have asymmetric stopprs, which allows rotamers to be obtained. The synthesis of the [2]rotaxanes was performed by clipping reaction, ...
Síntese de 1,4-diazaciclo-2-ilidenos N-pirrolil/furanil substituídos
(Universidade Federal de Santa Maria, 2018-08-06)
This work presents the synthesis of piperazines, 1,4-diazepanes and 1,4-diazocanes
pyrrolyl or furanyl-functionalized at the N4 position of the diazacycle. In this manner, four series
of compounds were prepared, with a ...
Síntese e dinâmica rotacional de [2]rotaxanos contendo 1-benzidrilpiperazina no eixo molecular
(Universidade Federal de Santa Maria, 2020-02-03)
This dissertation describes the synthesis of molecular the threads ((E)-1,4-bis(4-benzydrylpiperazin-1-yl)but-2-ene-1,4-dione, 1,4-bis(4-benzydrylpiperazin-1-yl)butan-1,4-dio ne, (E)-1,4-bis(dibutylamine)but-2ene-1,4-dione ...