Abstract
Abstracttrans(Cl)‐Ru(bpy)(CO)2Cl2 (1; bpy = 2,2′‐bipyridine) was found to efficiently isomerize to cis(Cl)‐1 in DMSO by addition of a catalytic amount of NaBH4, even at room temperature. The isomerization reaction is air sensitive, but does not require photoirradiation. Addition of the Cl– ion remarkably accelerates the reaction. A plausible chain reaction mechanism mediated by the reduced ruthenium dimer and monomer of 1 is proposed for the trans–cis isomerization.
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