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.
[Madsen, Robert; Udodong, Uko E.; Roberts, Carmichad; Mootoo, David R.; Konradsson, Peter; Fraser-Reid, Bert Journal of the American Chemical Society, 1995 , vol. 117, # 5 p. 1554 - 1565]
