Photocycloaddition of electron-deficient arylalkenes to chrysene stereoselectively occurred at 5,6-position of chrysene ring to give two (2π + 2π) photocycloadducts through sandwich-type singlet exciplexes. Photocycloreversion took place via the excited singlet states of the photocycloadducts.
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Maeda et al. (2000) studied this question.
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