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  1. Bipyridyl ligands are commonplace in catalysis. Structurally similar to this ligand class with unique properties is the novel di-(2-pyridyl)methanesulfonate (dpms) ligand, which is prepared and reacted with [Cp*IrCl2]2 to afford Cp*Ir(dpms)Cl (1) in high yield. Its single-crystal X-ray structure indicates an exo–(kappa2) conformation of the ligand, with the sulfonate group directed away from the iridium center. Halogen exchange by treatment of 1 with NaI gives the iodide derivative, Cp*Ir(dpms)I (2). Abstraction of the halogen from 1 using AgPF6 generates [Cp*Ir(dpms)]PF6 (3), which was not found to activate the C-H bonds of benzene. 
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  2. null (Ed.)