Lewis acid catalyzed synthesis of poly(pyrazolyl)borate ligands
Lewis acids catalyze the reaction of Li[MeBH3] and Na[BH 4] with pyrazoles to yield poly(pyrazolyl)borates under mild conditions. The reaction of Li[MeBH3] with 2 equiv of 3-mesitylpyrazole (HpzMs) at 23 °C (2 d