Synthesis and Properties of a Cyclopentadienone Tantalum(I) Complex: Large Electron Donation from Ta(I) to the Cyclopentadienone Ligand

Cyclopentadienone–metal complexes are active toward various bond cleavages via unique metal–ligand cooperation (MLC). Herein, we report the synthesis of a cyclopentadienone (CpO) tantalum(I) complex, which is a rare example of a CpO early transition metal complex. The obtained complex was analyzed by NMR, IR, and DFT calculations and exhibited the strongest metal-to-CpO electron donation among the CpO metal complexes reported previously.