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- W2036715572 abstract "The photochemical cycloreversion of four endoperoxides of the tetracene series was investigated in the wavelength region from 313 to 248 nm. A strong wavelength dependence of the corresponding quantum yield Q1 was observed throughout this spectral region. A comparison of the electronic spectra of the unsymmetrical endoperoxides with the spectra of their individual chromophores indicates that the singlet manifold of the endoperoxides is composed additively of the excited singlet states of three different chromophores. Obviously the distinct wavelength dependence of Q1 reflects the high density of excited singlet states Sn (n ⩾ 3), from each of which the reaction channel of cycloreversion is accessible. In contrast, the S1 state and, surprisingly, also the S2 state are photochemically inactive with respect to the cleavage of the endoperoxides into hydrocarbon and oxygen. Possible reasons for the inactivity of the S2 state are discussed." @default.
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- W2036715572 date "1984-10-01" @default.
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- W2036715572 title "Reactions originating from upper excited singlet states Sn (n ⩾ 3): the photochemical cycloreversion of several endoperoxides of the tetracene series" @default.
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- W2036715572 doi "https://doi.org/10.1016/0047-2670(84)87067-7" @default.
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