p-Toluenesulfonyl Chloride
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p-Toluenesulfonyl chloride or tosyl chloride (abbreviation: TsCl) is the compound obtained when the hydroxy group in the molecule of p-toluenesulfonic acid is replaced with a chlorine atom.
p-Toluenesulfonyl chloride is the reagent used to convert alcohols into alkyl tosylates.
eg:
see also methanesulfonyl chloride