Cyclopentadienyl Yttrium Ene-Diamido Complexes: Coupling of the Ene-Diamido Ligand with Isocyanate

The yttrium ene-diamido complexes supported by Cp (C5H5) and Cp* (C5Me5) ligands have been synthesized and characterized. The reactions of the Cp* derivative with the isocyanate ArNCO (Ar = 2,6-iPr2C6H3) led to the C–C coupling of the ene-diamido ligand with ArNCO, while reaction of the Cp derivative resulted in not only the same C–C coupling but also the C–N coupling of the C–C coupling product with another molecule of ArNCO, demonstrating the unique reactivity of ene-diamido ligands in rare-earth chemistry. The products have been characterized by X-ray single-crystal analysis.