Tl(I), Fe(II), and Co(II) Complexes Supported by a Monoanionic <i>N,N,N</i>‘-Heteroscorpionate Ligand Bis(3,5-di-tertbutylpyrazol-1-yl)-1-CH₂NAr (Ar = 2,6-ⁱPr₂C₆H₃)

The lithium salt (L)Li(THF) (L- = bis(3,5-di-tertbutylpyrazol-1-yl)-1-CH2NAr, Ar = 2,6-iPr2C6H3) can be readily prepared from lithium bis(3,5-di-tertbutylpyrazol-1-yl)methide and the N-methyleneaniline H2CNAr. This N,N,N‘-heteroscorpionate lithium reagent can be transmetalated with Tl(OTf), FeCl2(THF)1.5, and CoCl2 to yield the (L)Tl, (L)FeCl, and (L)CoCl complexes, respectively. Single crystal structural data for compounds (L)Li(THF), (L)Tl, (L)FeCl, and (L)CoCl reveal in each case the hapticity of the sterically demanding, monoanionic L- ligand to be κ3-N3.