“…The first and second considerations above both lead one to expect the rotations of an anomeric pair of acylated glycofuranosyl fluorides to lie quite close together and, in the absence of other evidence, Pedersen and Fletcher31 appeared justified in concluding that their substances constituted an anomeric pair. Now, however, we must compare the rotations of these two fluorides (48,800 and 56,700) with that of 1,4-anhydro-Dribitol tribenzoate (+47,800). Here the rotation of the anhydride falls outside the range between the two fluorides and we must therefore now regard it likely that the tri-0-benzoyl-/3-D-ribofuranosyl fluoride reported earlier31 is a mixture of anomers or, possibly, a molecular compound of the two anomers.…”