Laser flash photolysis study of the reaction of 1H-benz[f]indane-1,2,3-trione with olefins

Journal of the Brazilian Chemical Society

Monica Teixeira Da Silva¹  José Carlos Netto-ferreira¹ 

[1] ,Universidade Federal Rural do Rio de Janeiro Departamento de Química Seropédica RJ ,Brazil

关键词: cyclic vicinal triketone;    laser flash photolysis;    triplet state;   

DOI  :  10.1590/S0103-50532004000400021

来源: SciELO

【 摘 要 】

The photochemistry of 1H-benz[f]indane-1,2,3-trione (1) in the presence of olefins has been examined in benzene solution at room temperature by laser flash photolysis. The triplet excited state of 1 (tau = 3 mus, lambda = 460 and 490 nm, in benzene) is quenched by olefins containing allylic hydrogen with rate constants ranging from 10(5) L mol-1s-1 (for 1,5-hexadiene) to 10(9) L mol-1s-1 (for 2,5-dimethyl-2,4-hexadiene). A comparison of the reactivity of 1 with that of 1,2,3-indantrione (2) shows that a similar mechanism for the quenching by olefins is operating for the two cyclic vicinal triketones and involves essentially the lowest triplet excited state of n,pi* character.

【 授权许可】

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