Acetolysis of 1,6-anhydro sugars can be achieved by treatment with acetic anhydride and triethylsilyl trifluoromethanesulphonate at 0 °C for 5–15 minutes, under which conditions a wide variety of protecting groups are unaffected, and even the trisulphonate is cleaved, albeit in six hours.
M. Zottola, B. V. Rao and B. Fraser-Reid, J. Chem. Soc., Chem. Commun., 1991, 969 DOI: 10.1039/C39910000969
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