Synthesis and Reactivity of Photochromic 2H-Chromenes Based on 3-Carboxylated Coumarins
作者:Nuno M. F. S. A. Cerqueira、Lígia M. Rodrigues、Ana M. F. Oliveira-Campos、Luís H. Melo de Carvalho、Paulo J. Coelho、Roger Dubest、Jean Aubard、André Samat、Robert Guglielmetti
DOI:10.1002/hlca.200390264
日期:2003.9
New photochromic 2H-chromenes (=2H-1-benzopyrans) including a 3-carboxylated coumarin nucleus were synthesized from hydroxycoumarins, and, in one case, the corresponding trimethoxysilylcarboxamide was prepared. The photochromic behavior 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
由羟基香豆素合成了包括3-羧基化香豆素核的新的光致变色的2 H-苯甲基(= 2 H -1-苯并吡喃),在一种情况下,制备了相应的三甲氧基甲硅烷基羧酰胺。在快速光解条件下研究了光致变色行为。在香豆素核的这个位置引入吸电子取代基,导致开放形式的光谱发生全局性显着的红移,并引起了显着的着色性增强。