rac-2,2'-Bis(diphenyl­phosphan­yl)-1,1'-binaphth­yl: a racemic diphosphine ligand

The asymmetric unit of the title compound, C₄₄H₃₂P₂, conventionally abbreviated BINAP, is one half of the complete chiral BINAP mol­ecule, which adopts a C2 crystallographic point-group symmetry with a twofold axis splitting the mol­ecule in two identical halves; a center of symmetry between mol­ecules further determines the racemic pairs. There are no obvious supra­molecular inter­actions between adjacent BINAP mol­ecules.