Abstract
The formation of heterocoerdianthrone (HCD) following laser pulse photolysis of its endoperoxide (HCDPO) was observed by laser-induced fluorescence. The rise time of HCD was determined to be τ r = 40±10 ps. The lifetime of the S 3(ππ *) state of HCDPO, from which cycloreversion occurs, was estimated by steady-state fluorescence measurements to be τ < 3 ps. These results indicate photocycloreversion of HCDPO as a two-step reaction.
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