SnII(OTf)2 has unique properties to convert cellulose to valuable esters in MeOH.
Main esters are methyl lactate, methyl vinyl glycolate and methyl levulinate
SnII(OTf)2 has both a Brønsted and Lewis acidic active component
The OTf/Sn ratio steers the reaction outcome, either via retro-aldol or dehydration
Total ester yields (carbon-based mol%) reside in the 60% range (2 h, 200 °C)