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Your search keyword '"Laia, César A.T."' showing total 2 results
Start Over Author "Laia, César A.T." Topic chemical reactions
2 results on '"Laia, César A.T."'

1. On the photostationary state of the flavylium network of chemical reactions.

Author

Pina, Fernando, Gomes, Raquel, Basílio, Nuno, and Laia, César A.T.

Subjects
*PHOTOSTATIONARY states, *PYRYLIUM compounds, *CHEMICAL reactions, *HYDROXYL group, *CHARTS, diagrams, etc.
Abstract

Highlights: [•] Photostationary state of the flavylium network of chemical reactions is analyzed. [•] A energy diagram is proposed to visualize the photostationary state. [•] The model compound 4′,7-dihydroxyflavylium was used to test the model. [ABSTRACT FROM AUTHOR]

Published
2013
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2. 2′-Hydroxyflavylium: introducing flavanones into the flavylium network of chemical reactions

Author

Petrov, Vesselin, Gomes, Raquel, Parola, A. Jorge, Jesus, Alexandre, Laia, César A.T., and Pina, Fernando

Subjects
*CHEMICAL processes, *CHEMICAL reactions, *HYDROGEN-ion concentration, *SALTS
Abstract

Abstract: Chalcones possessing a hydroxyl group in position 2 cyclize to form flavylium salts in acidic media, this reaction being reversible under neutral–basic conditions. On the other hand, chalcones possessing a hydroxyl group in position 2′ cyclize to form flavanones in basic media. By synthesizing 2′-hydroxyflavylium tetrafluoroborate, it was possible to obtain trans-2,2′-dihydroxychalcone that in solution can evolve to 2′-hydroxyflavanone or back to 2′-hydroxyflavylium depending on the pH. The several equilibria established in aqueous solution were fully characterized. The importance of including flavanones into the flavylium network of chemical reactions is briefly exploited. [Copyright &y& Elsevier]

Published
2008
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