Synthesis of hemiacetals

Recent Literature

A facile chemoselective deprotection of anomeric O-methyl glycosides affords the corresoponding lactols in very good yields within 10-40 min with use of trityl tetrafluoroborate in dichloromethane at ambient temperatures. The present method is easily implemented and tolerates various functional groups.
A. Kumar, V. R. Doddi, Y. D. Vankar, J. Org. Chem., 2008, 73, 5993-5995.