Pentagerma[1.1.1]propellane: a combined experimental and quantum chemical study on the nature of the interactions between the bridgehead atoms.

Ge, whiz! A detailed study of the synthesis, structure, redox chemistry, and bonding properties of pentagerma[1.1.1]propellane (1, see picture) examines fundamental aspects of the interactions between the bridgehead germanium atoms. DFT and CASSCF calculations unravel the biradicaloid characteristics of 1, and preliminary reactivity studies indicate that 1 features some radical-type behavior.