# Oxidation of alkyl side chain using KMnO4 [duplicate]

I was reading about side chain oxidation of alkyl side chains of benzene using alkaline $\ce{KMnO4}$ and heat. My book (Solomon's and Frhyle) says that this is only for compounds having a benzylic hydrogen and has given examples of ethyl and methyl benzene. I have searched the internet but could not find a mechanism. I tried to find something of my use in that research paper given in this link.
• Also, all alkylated benzenes do not oxidize, for example, t-butyl benzene is inert to $\ce{KMnO4}$ – ron Jul 8 '15 at 16:54