1-Tosyl- and 1-dansyl-4-dimethylaminopyridinium chlorides are easily prepared and may react selectively with tyrosine residues of proteins in aqueous media, leading to stable O-arylsulphonates.
E. Guibe-Jampel, M. Wakselman and D. Raulais, J. Chem. Soc., Chem. Commun., 1980, 993 DOI: 10.1039/C39800000993
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