Reaction of N-methylpyrrolidine and tosyl chloride in the presence of AgClO4 afforded N-methyl-N-tosylpyrrolidinium perchlorate (II) as a stable, crystalline salt, which can be used for the selective tosylation of an amino-group in the presence of a hydroxy-group.
T. Oishi, K. Kamata, S. Kosuda and Y. Ban, J. Chem. Soc., Chem. Commun., 1972, 1148 DOI: 10.1039/C39720001148
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