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The reaction has been superseded in synthetic chemistry by the Upjohn dihydroxylation and later by the Sharpless asymmetric dihydroxylation.