Buscar
Itens para a visualização no momento 21-30 of 347
Avaliação de arranjos supramoleculares de complexos triazenidos de mercúrio (II) e cobre(II)
(Universidade Federal de Santa Maria, 2007-10-10)
The reaction between deprotonated 1,3-Bis(3-acetylphenyl)triazene and Hg(CH3COO)2 in methanol, yields [Hg(RNNNR)(Py)] (R=3-CH3C(O)C6H4) (1), a triazenide dimeric mononuclear complex of mercury(II). The crystal structure ...
Síntese de 5-hidróxi-3-(1,1-dimetoxietan-2-il)-5-trifluormetil-2-pirazolinas e 3-(1,1-difluoretan-2-il)-1H-pirazóis análogos
(Universidade Federal de Santa Maria, 2008-02-01)
This work describes, at first, the synthesis of 4,6,6-trimethoxy-1,1,1-trifluorohex-3-en-2-one by the acylation reaction of 1,1,3,3-tetramethoxybutane, in 65% yields.
Afterwards, the synthesis of a new series of ...
Estudo da interação do alumínio com o ácido glucônico
(Universidade Federal de Santa Maria, 2005-08-19)
Parenteral solutions are used for patients with complexes diseases, for pre-term infants and surgical patients. The administration of solutions contaminated by aluminium for a long period of time can lead to severe ...
Uso de microondas na síntese de 3-alquil(aril)-5-hidróxi-5-triclorometil-4,5-diidro-1h-pirazol-1-carboxiamida
(Universidade Federal de Santa Maria, 2005-03-01)
A series of 3-alkyl and 3-aryl-5-hydroxy-5-trichloromethyl-4,5-dihydro-1Hpirazoles-1-carboxiamide that possess biological activity they were synthesized, in good yeld, through the cyclocondensation, in microwaves, of ...
Avaliação da atividade antimicrobiana de derivados isoxazóis
(Universidade Federal de Santa Maria, 2005-03-03)
Isoxazoles compounds have been showing a great variety of pharmacological activities. Such activities might be increased by the presence of halomethyl-substitute groups in isoxazoles. This work shows the synthesis of the ...
Síntese, reatividade e atividade antimicrobiana de β-enamino ésteres α-clorados utilizando K-10 e irradiação de microondas
(Universidade Federal de Santa Maria, 2005-12-15)
Enamino carbonylic compounds are important synthetic intermediates used in the synthesis of heterocycles and natural products. Our group of research has been dedicating much of our efforts to the development and implementation ...
Uso de modelos multivariados para a avaliação do valor de dienos em amostras de gasolina de pirólise
(Universidade Federal de Santa Maria, 2005-12-19)
The quality of gasoline may be affected by the presence of several compounds. Among them, the conjugated dienes play an important role due to the fact that their presence is strongly associated with gum formation, which ...
Consistência no cálculo perturbativo: a eletrodinâmica quântica e a anomalia
(Universidade Federal de Santa Maria, 2004-12-13)
We use a very general calculational method, concerning the divergences manipulations and calculations, in order to treat the perturbative solution of quantum electrodynamics (QED), at the one loop level, as well as to study ...
Variações espaciais de propriedades físicas do remanescente de supernova RCW 103
(Universidade Federal de Santa Maria, 2008-06-19)
Since the observation of the supernova event SN 1987A, observational research on supernova and supernova remnants, including the ones on the optical spectrum,
has been much explored. However, most of these studies have ...
Estuda da formação de vacância induzida em nanotubos de carbono
(Universidade Federal de Santa Maria, 2004-12-14)
In this work we have performed the study of the single vacancy and the induced vacancy in carbon nanotubes by first-principles calculations using the SIESTA code,
which solves the Kohn-Sham equations via the local density ...