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.