Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Vicente G. Toscano"'
Publikováno v:
Journal of Physical Organic Chemistry. 11:25-30
The reaction of OH− ion with 1,ω-bis(2-bromopyridinium)alkanes, where the reaction centers are separated by a varying number of methylene groups, was investigated to model the increased velocity of OH− attack on premicellar aggregated N-alkylpyr
Autor:
Júlio César Dias Lopes, M. Regina Alcantara, Ivan P. de Arruda Campos, Gunter Ebeling, Daisy de Brito Rezende, Vicente G. Toscano
Publikováno v:
Tetrahedron. 53:10113-10122
13C and 1H NMR data for a series of α-halo derivatives of o-xylene are presented. A dynamic 1H NMR investigation of α,α,α′,α′-tetrabromo-o-xylene (5) was performed and the spectrum of the most stable conformer at 213 K is presented. The free
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 101:11-20
A comparative study of the photophysical properties of three flavonoids (flavone (F), 7-methoxyflavone (7MF) and 3-methoxyflavone (3MF)), which may serve as models for naturally occurring flavonoids, shows a distinct behaviour of the 3-methoxy deriva
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 89:141-146
Conjugation of π electrons between imide groups vicinal to arene moieties can drive the photophysical and photochemical properties to a mixed transition of close lying states having n , π ∗ and π,π ∗ characters (Almeida et al., J. Photochem.
Publikováno v:
J. Chem. Soc., Perkin Trans. 2. :1857-1862
The α-brominated ortho-xylenes have been subjected to 254 nm irradiation in deaerated benzene, isooctane and benzene–cyclohexene. The product analysis revealed that homolysis of the C–Br bond is followed by a series of hydrogen abstraction and r
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 76:55-60
Photophysical studies of 1.8 ( I ) and 2.3 ( II ) N-butylnaphthalimides were realized. UV/Vis absorption and fluorescence properties for I and II as a function of solvent polarity and proticity show a higher π orbital interaction between the imide a
Publikováno v:
Tetrahedron Letters. 42:2613-2615
1-Chloro-4,6,8-trimethylazulene is formed almost exclusively upon UV irradiation of a deaereted benzene solution of 4-chloromethyl-6,8-dimethylazulene. This photoproduct was identified by 1 H and 13 C NMR spectroscopy of both the isolated photoproduc
Publikováno v:
ChemInform. 27
Publikováno v:
ChemInform. 27
Autor:
D. De B. Rezende, Vicente G. Toscano, I. P. De Arruda Campos, M. R. Alcantara, Gunter Ebeling, Júlio César Dias Lopes
Publikováno v:
ChemInform. 28