Methylidyne Transfer as a Plausible Deactivation Pathway for Ynene Metathesis

Niobium methylidyne [(PNP)Nb≡CH(OAr)] (1) (PNP– = N[2-PiPr2-4-methylphenyl]2–, Ar = 2,6-iPr2C6H3) reacts with excess ethylene to afford the propenyl-ethylene complex [(PNP)Nb(HC═CHCH3)(η2-H2C═CH2)(...