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Nitronas: estudos de síntese e reactividade

Authors: Silva, Andreia Filipa Ferreira da;

Nitronas: estudos de síntese e reactividade

Abstract

O trabalho descrito nesta dissertação foi desenvolvido tendo como objectivo a funcionalização de porfirinas e corróis através de reacções de ciclo-adição 1,3- dipolar envolvendo diferentes dipolarófilos. Neste trabalho, desenvolveu-se um estudo de tentativa de optimização da reacção de cicloadição 1,3-dipolar com nitronas em que porfirinas são utilizadas como dipolarófilo. Foram também estudadas reacções em que derivados porfirínicos e corrólicos são utilizados como percursores de 1,3-dipolos, mais especificamente, nitronas, em reacções de ciclo-adição 1,3-dipolar, com vários dipolarófilos, acetilenodicarboxilato de dimetilo, fumarato de dimetilo, propiolato de etilo. Tais reacções permitiram no caso das porfirinas, a introdução de anéis isoxazolidina e isoxazolina na posição β-pirrólica. No caso dos corróis, apenas a reacção com o fumarato de dimetilo levou à formação de um cicloaducto contendo um anel isoxazolidina. A estrutura dos compostos sintetizados foi estabelecida com recurso a técnicas espectroscópicas actuais, nomeadamente ressonância magnética nuclear (RMN de 1H, 13C, COSY, HSQC, HMBC) e espectrometria de massa em MALDI e UV-Vis.

The research work described in this dissertation was focused on the porphyrin and corrole functionalization through 1,3-dipolar cycloaddition reactions involving different dipolarophiles. In this work were developed an attempted to optimize the 1,3-cycloadittion reaction with nitrones, where porphyrin were used as dipolarophile. Were also study the reactions in which the porphyrinic and corrolic derivatives were used as dipolar species, more specifically, nitrones, in 1,3-dipolar cycloaddition reactions with several dipolarophiles, dimethyl acetylenedicarboxilate, dimethyl fumarate, ethyl propiolate. In the case of porphyrins, such reactions allowed the introduction of isoxazolidine and isoxalidine rings in the β-pirrolic position. In the case of corroles, only the reaction with dimethyl fumarate led to the formation of isoxalidine ring. The structural analysis of the synthesized compounds was made by using several spectroscopic methods mainly nuclear magnetic resonance (1H, 13C, COSY, HSQC, HMBC), mass spectrometry and UV-Visible.

Mestrado em Química Orgânica e Produtos Naturais

Country
Portugal
Related Organizations
Keywords

Cicloadição, Síntese química, Reactividade (Química), Química dos produtos naturais, Porfirinas

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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Average
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