2,4-Di-tert-butyl-6-({4-[(3,5-di-tert-butyl-2-hydroxyphenyl)methyl]piperazin-1-yl}methyl)phenol (CAS# 110546-20-8) is a used as a multidentate ligand in the preparation of zirconium-based catalysts for hydrophosphination reactions of alkenes and heterocumulenes.