Laser Flash Photolysis Study of the Reaction of 1H-Benz[f]indane-1,2,3-trione with Olefins
نویسندگان
چکیده
A fotoquímica de 1H-benz[f]indano-1,2,3-triona (1) em presença de olefinas, em solução de benzeno e a temperatura ambiente, foi examinada empregando a técnica de fotólise por pulso de laser. O estado excitado triplete de 1 ( = 3 s, = 460 e 490 nm, em benzeno) é suprimido por olefinas contendo hidrogênio alílico com constantes de velocidade variando de 10 L mols (para 1,5hexadieno) a 10 L mols (para 2,5-dimethyl-2,4-hexadieno). A comparação entre a reatividade de 1 com a de 1,2,3-indanotriona (2) mostra que um mesmo mecanismo de supressão está operando nos dois casos, o qual envolve, essencialmente, o estado excitado triplete de energia mais baixa da tricetona vicinal cíclica com característica n, *.
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