Unprecedented pentadenticity of the HB(3-Phpz)3 (= TpPh) ligand

Abstract

Previously unobserved pentadentate coordination of a tris(pyrazolyl)borate ligand has been ascertained in the compound Ir[κ⁵(N,N′,N″,C^Ph,C^Ph′)-Tp^Ph](η²-C₂H₄) (Tp^Ph = hydridotris(3-phenylpyrazolyl)borate] that forms by thermal activation of a mixture of [IrCl(coe)₂]₂ (coe = cyclooctene) with TlTp^Ph and ethene, through the intermediacy of Ir[κ⁴(N,N′,N″,C^Ph)-Tp^Ph](Et)(η²-C₂H₄).