1.3.9 Oxidation of Aromatic Ring

Chromium based reagents are extensively used for the partial oxidation of cyclic hydrocarbons to the quinones (Scheme 14).

Scheme 14

1.3.10 Asymmetric Epoxidation

Chiral chromium(VI)-salen complex has been studied for asymmetric epoxidation of trans alkenes (Scheme 15). The reaction works in both catalytic and stoichiometric mode but the stoichiometric mode works slightly well than catalytic mode.

Scheme 15