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https://hdl.handle.net/1822/2200
Título: | Synthesis and photochromic behaviour of new methyl induced linear and angular thieno-2H-chromenes |
Autor(es): | Queiroz, Maria João R. P. Plasencia, Paula M. S. Dubest, Roger Aubard, Jean Guglielmetti, Robert J. |
Palavras-chave: | Thieno-2H-chromenes Hydroxybenzo[b]thiophenes Photochromism Flash photolysis |
Data: | 2003 |
Editora: | Elsevier 1 |
Revista: | Tetrahedron |
Citação: | "Tetrahedron". 59 (2003) 2567-2573. |
Resumo(s): | New methyl induced linear and angular thieno-2H-chromenes 4, 5 and 6 were prepared by reaction of new methylated 6-hydroxybenzo[b]thiophenes 2 (a, b and c) and propargylic alcohols 3a and 3b, using acidic Alumina Brockmann I as catalyst and drying agent. Compounds 2 were prepared in good to excellent yields in a “one pot” three step reaction from the corresponding bromo compounds 1. The photochromic behaviour of compounds 4, 5 and 6b was evaluated with the aid of a classical set of spectrokinetic parameters, and compared to reference compounds that are benzoannellated in the 5,6 and 6,7 positions of the chromene (naphthopyrans) and also to thieno-2H-chromenes 7 and 8, previously prepared, which are analogues of 5a. The resistance to fatigue (photodegradation) under continuous irradiation was also evaluated. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/2200 |
DOI: | 10.1016/S0040-4020(03)00262-X |
ISSN: | 0040-4020 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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TET5461.pdf | 149,04 kB | Adobe PDF | Ver/Abrir |