Organometallic Ni(ii), Ni(iii), and Ni(iv) complexes relevant to carbon–carbon and carbon–oxygen bond formation reactions

Abstract

Herein, the pyridinophanetetradentate ligand 3,6,9-trimethyl-3,6,9,15-tetraazabicyclo[9.3.1]pentadeca-1(15),11,13-triene, PyNMe₃, is used to isolate and structurally characterize well-defined organometallic Ni(II) and Ni(III) complexes bearing the cycloneophyl fragment, an alkyl/aryl C-donor ligand. Furthermore, spectroscopic and cryo-mass spectrometry studies suggest the formation of a transient Ni(IV) organometallic complex, and its relevance to C–C and C–O bond formation reactivity studies is discussed.