Synthesis of zirconium(IV) and hafnium(IV) isopropoxide, sec -butoxide and tert -butoxide

We revisited the synthesis of zirconium(IV) and hafnium(IV) alkoxides, namely the metal isopropoxide isopropanol complex (M(OiPr) ·iPrOH, M = Zr, Hf) and the metal - and -butoxide (M(O Bu) and M(O Bu) , M = Zr, Hf). We optimized the most convenient synthesis methods and compared the products with commercial sources. En route to the metal - and -butoxides, we synthesized the metal diethylamido complex (M(NEt ) , M = Zr, Hf).