Additions and intramolecular migrations of nucleophiles in cationic diruthenium μ-allenyl complexes

Hydride and halide anions readily replace the acetonitrile ligand in the diruthenium μ-allenyl complex 3b. The hydride can successively migrate to the Cα carbon of the allenyl moiety, and then to Cβ, affording 9 as the most stable product. The μ-vinyl-chlorocarbene adduct 10 is believed to be formed from 4b by chloride migration to Cα and hydrogen migration from Cα to Cβ.