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Unlike standard 2<jats:italic>H<\/jats:italic>\u2010chromenes that give rise to two coloured species (one short\u2010 and one long\u2010lived) under UV irradiation, flash photolysis studies on this particular 2<jats:italic>H<\/jats:italic>\u2010chromene show that the opening of the pyran ring led to the formation of a single, coloured, open species that bleaches to the uncoloured initial form in &lt;1 ms. The design of this fused 2<jats:italic>H<\/jats:italic>\u2010chromene avoids the formation of the undesirable long\u2010lived, <jats:italic>transoid\u2013trans<\/jats:italic>, coloured, open form; therefore, the colour fades very quickly, according to monoexponential kinetics, without the persistence of any residual colour commonly observed in 2<jats:italic>H<\/jats:italic>\u2010chromenes. Acid treatment of 4\u2010[(ethoxycarbonyl)methyl]\u20102<jats:italic>H<\/jats:italic>\u2010chromenes led to the formation of lactones.<\/jats:p>","DOI":"10.1002\/ejoc.201101702","type":"journal-article","created":{"date-parts":[[2012,2,6]],"date-time":"2012-02-06T08:47:20Z","timestamp":1328518040000},"page":"1768-1773","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Synthesis of a Photochromic Fused 2<i>H<\/i>\u2010Chromene Capable of Generating a Single Coloured Species"],"prefix":"10.1002","volume":"2012","author":[{"given":"C\u00e9u M.","family":"Sousa","sequence":"first","affiliation":[]},{"given":"Jo\u00e3o","family":"Pina","sequence":"additional","affiliation":[]},{"given":"Jo\u00e3o","family":"Seixas de Melo","sequence":"additional","affiliation":[]},{"given":"Jerome","family":"Berthet","sequence":"additional","affiliation":[]},{"given":"Stephanie","family":"Delbaere","sequence":"additional","affiliation":[]},{"given":"Paulo J.","family":"Coelho","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2012,2,6]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1016\/B978-044452176-7\/50004-8"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1478-4408.2009.00204.x"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/jo035279r"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.tetlet.2005.02.091"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1039\/c1pp05094j"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jphotochem.2008.08.013"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol0701621"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jphotochem.2009.10.014"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jphotochem.2008.03.019"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1039\/b701706e"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0143-7208(00)00083-8"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1139\/v96-182"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0040-4020(01)01187-5"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jphotochem.2007.07.029"},{"key":"e_1_2_6_15_2","first-page":"26","volume":"39","author":"Higgins S.","year":"2003","journal-title":"Chem. 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