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Synthesis and Reactivity of Photochromic 2 H ‐Chromenes Based on 3‐Carboxylated Coumarins
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 introduc...
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Published in: | Helvetica chimica acta 2003-09, Vol.86 (9), p.3244-3253 |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | 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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ISSN: | 0018-019X 1522-2675 |
DOI: | 10.1002/hlca.200390264 |