The synthesis and structural characterization of phenyl tris(3-t-butylpyrazolyl)borato alkyl complexes of magnesium and zinc, [PhTpBut]MgR (R=Me, Et) and [PhTpBut]ZnMe

Magnesium and zinc alkyl complexes supported by the phenyltris(3-t-butylpyrazolyl)borato ligand, [PhTpBut]MgR (R=Me, Et) and [PhTpBut]ZnEt, have been synthesized by reaction of [PhTpBut]Tl with R2M (M=Mg, Zn). Comparison of the structures of [PhTpBut]MMe with those of [TpBut]MMe indicates that the phenyl substituent on boron has an almost negligible effect on the MgC and ZnC bond lengths.