Arene Derivatives of Zirconium(II) and Hafnium(II)
The anhydrous tetrahalides MX4 (M = Zr or Hf, X = Br or I) were prepared by treating M(BH4)4 with dry HX in n-heptane as solvent, followed by sublimation under reduced pressure.The reaction of ZrCl4 with Al-AlCl3-aromatic hydrocarbon systems led to soluti