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An enviro-economic route for tosylation of alcohols and selective monotosylation of diols in good yield directly using p-toluenesulfonic acid together with metal-exchanged montmorillonite instead of p-toluenesulfonyl chloride or p-toluenesulfonic anhydride is described. The Fe 3+ -montmorillonite clay is the most effective catalyst among metal-exchanged montmorillonites for such tosylation...
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