The Milas hydroxylation is an organic reaction converting an alkene to a vicinal diol, and was developed by N. A. Milas in the 1930s.[1] The cis-diol is formed by reaction of alkenes with hydrogen peroxide and either ultraviolet light or a catalytic osmium, vanadium, or chromium oxide.
The reaction has been superseded in synthetic chemistry by the Upjohn dihydroxylation and later by the Sharpless asymmetric dihydroxylation.