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A Chiral Catalyst
Noyori and his co-workers developed a chiral diphosphine ligand

diagram: phosphinecanPhosphine can complex to transition metals through the lone pair of electrons on the phosphorus atom. Replacing the hydrogen atoms with other groups can give chiral ligands, and so chiral catalysts.

Noyori's diphosphine ligand, called BINAP


diagram: the BINAP molecule

It is chiral because the fused ring systems have to twist as you can see in the 3-D image

The company Takasago International has used BINAP in the industrial synthesis of menthol, since the early 1980s.