syn- and anti[3.3](1,4)Naphthalenophanes

Abstract
The title compounds were prepared by pyrolysis of disulfones. The absorption spectra depend rather on the stacking mode between two naphthalene rings than ring-to-ring distance, whereas for the emission spectra the reverse is the case. A [4+4]photocycloaddition and a reverse reaction were observed between anti-form and its photoisomer.

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