β-Mannosylation with 4,6-benzylidene protected mannosyl donors without preactivationElectronic supplementary information (ESI) available: General experimental procedures and analysis data. See DOI: 10.1039/c5cc04716a

Mannosylations with benzylidene protected mannosyl donors were found to be β-selective even when no preactivation was performed. It was also found that the kinetic β-product in some cases anomerizes fast to the thermodynamically favored α-anomer under typical reaction conditions. Mannosylations with benzylidene protected mannosyl donors were found to be β-selective even when no preactivation was performed.