# Oxidation of alkenes by selenium dioxide to diketones

I know that $$\ce{SeO2}$$ readily affects the allylic position. The reaction mechanism of this reaction goes like this:

Here, an $$\alpha$$-diketone is formed.
• $\ce{\alpha}$-diketones are often formed when $\ce{SeO2}$ reacts with alkynes that don't have any hydrogens on the carbons adjacent to the acetylenic carbons. Are you sure your book showed an alkene? – ron Nov 1 '15 at 23:32
• I found formation of an $\alpha$-diketone from a ketone, but not from an alkene. – TAR86 Mar 13 at 5:54