Synthesis and Structure of [2] Tetrelocenophanes

The concept of metallocenophanes has been well established for transition metals for a long time. Expanding this concept to p-block elements, the synthesis of sila[2] tetreloceno-phanes, with examples for germanium, tin, and lead as the central atoms, was explored. For the first time, the crystal structures of such compounds were obtained, and they gave intriguing insight into the geometry of this almost unexplored class of low-valent main-group molecules.