
Hydroquinidine 1,4-phthalazinediyl diether, commonly abbreviated as (DHQD)2PHAL, is a widely used ligand for the Sharpless asymmetric dihydroxylation reaction. Nobel Prize–winning (2001) chemist K. Barry Sharpless and coauthors reviewed its use in 1994. It is sold by Sigma-Aldrich–Fluka.
More about this molecule from CAS.