Carbon-Selenium Bond Cleavage by a Rhodium Complex

The complex Cp*Rh(PMe3)PhH (Cp* ) C5- Me5) reacts thermally with selenophene to give a C-Se insertion product. X-ray structural characterization shows a planar 6-membered ring containing a localized butadiene structure. 77Se NMR studies display an upfield resonance consistent with a non-aromatic met- allaselenabenzene ring.