The N-heterocyclic carbene (NHC) complexes [(RC 5 H 4 )Ni-(X)(NHC)] (2-5) have been prepared by treating nickelocene [or 1,1Ј-bis(alkenyl)nickelocene] with a suitable carbene precursor. The alkenylcyclopentadienido complexes 4 and 5 undergo chemoselective cross-metathesis with methyl acrylate or methyl vinyl ketone in the presence of the seocnd-generation Grubbs catalyst to yield complexes 6-8, which bear an α,β-unsaturated carbonyl substituent on the cyclopentadienido ligand. The X-ray crystal structure of 2 [monoclinic,
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