Syntheses of Aluminum and Zinc Alkyl Complexes of a Highly Fluorinated Tris(pyrazolyl)borate Using [HB(3,5-(CF3)2Pz)3]Ag(THF) as the Ligand Transfer Agent

Dimethylaluminum or ethylzinc complexes of highly fluorinated tris(pyrazolyl)borate ligand [HB(3,5-(CF3)2Pz)3]^- can be obtained in excellent yield from the reaction between the silver adduct [HB(3,5-(CF3)2Pz)3]Ag(THF) and the metal alkyl reagent Me3Al or Et2Zn. The X-ray crystal structure of [HB(3,5-(CF3)2Pz)3]AlMe2 shows that the tris(pyrazolyl)borate ligand coordinates to the aluminum center in (kappa)^2-fashion. [HB(3,5-(CF3)2Pz)3]ZnEt features the typical (kappa)^3-bonded ligand.