Alkyl side-chains may be oxidized to benzoic acid (or perhaps a benzoic acid derivative if you will find other teams present around the ring) by potassium permanganate (KMnO4) as long as being the benzylic carbon has at least one hydrogen attached. The mechanism generally commences with addition of the nucleophile https://bromazolamkaufenohnerezep03693.blogminds.com/the-2-minute-rule-for-solution-bromure-de-potassium-34564176