Similarly, the vinyl ether product 2m was constructed to facilitate a subsequent Claisen rearrangement, generating the aldehyde product in good yield (3b 56 % over two steps). Mechanistically, we propose the generated Ru-H species coordinates an olefin after phosphine dissociation, providing an intermediate that can undergo a series of reversible 1,2-migratory insertion/-H-elimination reactions. This sequence is iteratively repeated until terminated to afford the thermodynamically most stable olefin. To examine the feasibility of the insertion/elimination mechanism for the transposition, we performed a crossover experiment with deuterated substrate 1k-d2 and 1c. We observed H/D exchange at the  and terminal methyl positions (6 % and 8 % respectively) positions, consistent with a reversible insertion/elimination pathway proceeding through a Ru-H species.