Abstract The regioselectivity and stereospecificity of reaction of asymmetrical alkenes such as addition of halogen, addition of hypohalous acid, oxymercuration-demercuration reaction, hydroboration-oxidation reaction, oxidation by dilute and cold permanganate, oxidation by peracid, etc. are analyzed in detail by examples, and the stereo-configuration of the reaction products are also discussed according to the mechanism.
