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The <jats:italic>leuco<\/jats:italic> form of the flavylium\u2010based dye is a spirolactone species whose ring opens at low temperature (below the solvent melting point) to form the blue flavylium cation. Decarboxylation of the lactone to give 4\u2010phenyl\u20107\u2010diethylamino\u20104\u2032\u2010dimethylamino\u20101\u2010benzopyrylium was observed upon irradiation of the system with UV light, erasing the thermochromic effect.<\/jats:p>","DOI":"10.1002\/chem.200903482","type":"journal-article","created":{"date-parts":[[2010,5,27]],"date-time":"2010-05-27T02:53:36Z","timestamp":1274928816000},"page":"7760-7766","source":"Crossref","is-referenced-by-count":25,"title":["Formation of a <i>leuco<\/i> Spirolactone from 4\u2010(2\u2010Carboxyphenyl)\u20107\u2010diethylamino\u20104\u2032\u2010dimethylamino\u20101\u2010benzopyrylium: Design of a Phase\u2010Change Thermochromic System Based on a Flavylium 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