ChemInform Abstract: Carbonylation Chemistry of the Tantalum Silyl (η5‐C5Me5)Cl3TaSiMe3. Synthesis, Characterization, and Reaction Chemistry of (η5‐C5Me5)Cl3Ta(η2‐COSiMe3) and Derivatives.

Abstract The Ta compound (I) is converted to the thermally unstable η2‐silaacyl complex (III), whose electrophilic behavior is demonstrated in its reactions with Lewis bases such as pyridines or phosphines leading to (V) or (VII), which are labile in solution.