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Insights into the mechanism of the unusual trans‐hydrogenation of internal alkynes catalyzed by {Cp*Ru} complexes were gained by para‐hydrogen (p‐H2) induced polarization (PHIP) transfer NMR spectroscopy. It was found that the productive trans‐reduction competes with a pathway in which both H atoms of H2 are delivered to a single alkyne C atom of the substrate while the second alkyne C atom is converted...
Wie die beiden Wasserstoffatome von H2 auf ein einzelnes Kohlenstoffatom eines Alkins übertragen werden, während das benachbarte Kohlenstoffatom zum Metallcarben wird, wurde erstmals von A. Fürstner et al. in ihrer Zuschrift auf S. 12608 ff. beobachtet. Die antiparallelen Spins “in den Händen” des Parawasserstoffs verrieten die in dieser Konstellation sonst wohl kaum wahrnehmbaren Zwillinge.
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