Scope of pinacol rearrangment in organic synthesis?

Answer 1

I don't really understand your question but pinacol (a diol) rearranges itself to form a carbonyl compound under acidic conditions. One of the OH groups becomes protonated and leaves as H2O forming a tertiary carbocation. A methyl group migrates over to the carbocation leaving a positive charge on the carbon with the remaining OH group. One of the lone pairs on the oxygen forms a double bond with the carbon. The proton on the oxygen then leaves to form a carbonyl compound called pinacolone. Check this out for more info. http://en.wikipedia.org/wiki/Pinacol_rearrangement