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Synthesis and Reactivity of Photochromic 2H-Chromenes Based on 3-Carboxylated Coumarins

✍ Scribed by 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

Publisher
John Wiley and Sons
Year
2003
Tongue
German
Weight
158 KB
Volume
86
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

New photochromic 2__H__‐chromenes (=2__H__‐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 bathochromic shift in the spectra of the open forms and to an interesting intensification in the colorability.

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ChemInform Abstract: Synthesis and Some
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