Selenanthrene is an organoselenium compound with the formula . It consists of a pair of benzene rings linked by a pair of selenium atoms. It is analogous to thianthrene, .
It adopts a folded shape of dihedral angle 125° owing to the C–Se–C angles of 97–98°. The central six-atom ring takes on a boat conformation, which rapidly inverts via a planar transition state. Oxidation of selenanthrene gives selenoxides, which are reagents for the dehydrogenation of alkenes.
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