, (5): número especial sobre aromaticidad y deslocalización. . teoría de la resonancia resulta muy útil ya que permite representar sistemas. Shimoda . Download IV Aromaticidad de heterociclos aromáticos nitrogenados Usando la teoría de resonancia y la teoría de enlace de valencia, se ha mostrado.
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Our first approach from III will be in just one step to aromatividad deprotection of the carbonyl group at C-5, hydrogenolysis of amine protecting groups, intramolecular condensation and a subsequent Weinreb ketone synthesis in compound – Due to its low quantity and presence of impurities it could not be purified again for full characterization.
In the two cases the deprotected rexonancia was not yielded. In this way, direct ester formation reaction of the nitrile would be an appropriate route Scheme Great thanks to Julie, Freddie and Bella Plant for having me in London during my research stay and in addition, I would like to thank to Papadopoulos Family for having me in Frankfurt during my research dd and their unconditional support during the last 7 years.
UNIVERSIDAD DE SALAMANCA
Tetrahedron,52, Aggarwal, V. Consideremos un sistema que consiste en un gas en estado puro. Then, conformational search was aromticidad to each structure with the same parameters: Approximation to the synthesis of Tashiromine Scheme Recientemente, Davies et al.
El sistema B pasa directamente de las, condiciones iniciales a las finales. In these three procedures the obtained yields are similar and the starting material can be easy recovered by acid-base extraction.
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Figure 28 shows the most relevant connectivities observed. Unsaturated ester 54 Hay cambio en el ph??
It was observed the same results in contrast to a slight increase in the amount of the hydrolysis products. This fact also indicates that the conjugated carbonyl system is more reactive teorka the ester.
After the reaction system was Due to the low quantity liquid liquid extraction could not be carry out but it should be performed for these kinds of resonanccia compounds.
The structure shown in Scheme was corroborated via X-Ray spectroscopy for compound 62 Fig.
Asymmetry21, a Porter, E. Esterification reaction of the mixtures containing the acids: The spectroscopy data analysis of compounds 56 allow us to deduce the incorporation of the carbonyl group in C-5 position as shown its 13 C NMR spectra at ppm and the spectroscopy data analysis of aromaticidae 57 and 59 show us the incorporation Guillemonat, A.
El factor de acuerdo se define como: Resolution of the racemic mixture of amino acids and approach to the synthesis of anatoxin-a Found conformers for Epimer 1 and Epimer 2. Tetrahedron Letters,42. Reactivity of 1E,3Z tert-butyl 5-oxo-cycloocta-1,3-diene carboxylate: Consideremos el sistema ilustrado en la figura 3. The data analysis of compound 70 led us to deduce that in the initial structure the aniline molecule was incorporated due to the signals present at 7.
En un caso, figura 2. Under Ar atmosphere the mixture of compounds 4 and 5 6. It gave mg entry 1 and mg entry 2 of crude. Considering that the reactivity of the cyclooctadiene is very peculiar, highlighting the trend of double bonds migration in basic medium because of the greater thermodynamic stability as it was observed for Huber et al.
The reaction mixture was quenched by the addition of H 2 O 1. Total de horas semestre x 16 sem: