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Synthesis and reactivity of photochromic 2H-chromenes based on 3-carboxylated c...
Cerqueira, N. M. F. S. A.; Rodrigues, Lígia M.; Campos, Ana M. F. Oliveira; Carvalho, Luís H. Melo de; Coelho, Paulo J.; Dubest, Roger; Aubard, JeanNew photochromic 2H-chromenes including a 3-carboxylated coumarin nucleus were synthesised from hydroxycoumarins, and, in one case, the corrresponding trimethoxysilylcarboxamide was prepared. The photochromic behaviour was studied under flash photolysis conditions. The introduction of electron-withdrawing substituents in this position of the coumarin nucleus led to a global and significant bathochromic shift in...
Data: 2003
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Origem: RepositóriUM - Universidade do Minho
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