A 4(II)-protected alpha -cellobiosyl fluoride is an efficient donor for the
enzymatic stepwise condensations onto methyl P-D-glycoside accepters. Thes
e reactions, catalyzed by the Cel7B E197A glycosynthase from Humicola insol
ens, gave cellodextrins from degree of polymerization 3 to 6 in high yields
.