Rocha, Djenisa H. A.Leal, Stephanie B.Seca, Ana M. L.Pinto, Diana C. G. A.Silva, Artur M. S.2014-03-312014-03-312013-09Rocha, Djenisa H. A.; Leal, Stéphanie B.; Seca, Ana M. L.; Pinto, Diana C. G. A.; Silva, Artur M. S. (2013). "New syntheses of potential biologically active xanthones and benzoxanthones". 10º Encontro Nacional de Química Orgânica and 1º Simpósio Luso-Brasileiro de Química Orgânica, Lisboa. 4-6 Setembro de 2013, IOC4, Book of Abstracts, pag. 61.http://hdl.handle.net/10400.3/293510º Encontro Nacional de Química Orgânica e 1º Simpósio Luso-Brasileiro de Química Orgânica, Lisboa, 4-6 Setembro de 2013.The synthesis of xanthones, adequately functionalized for a specific application, is a challenging task. In this presentation, will be disclosed our recent studies with this unique family of compounds, namely the one-pot photoinduced electrocyclisation of (E)-3-styrylflavones 1 and in situ oxidation of cycloadducts to give 5-phenyl-7H-benzo[c]xanthen-7-one derivatives 2,3a and aromatization studies of (E)-3-aryl-4-benzylidene-8-hydroxy-3,4-dihydro-1H-xanthene-1,9(2H)-diones 33b into 4-benzyl-1,8-dihydroxy-3-phenyl-9H-xanthen-9-one derivatives 4.engXanthonesSynthesisBenzoxanthonesconference object