Sm. Andersen et al., STRUCTURE OF 1,5-ANHYDRO-D-FRUCTOSE - X-RAY-ANALYSIS OF CRYSTALLINE ACETYLATED DIMERIC FORMS, Journal of carbohydrate chemistry, 17(7), 1998, pp. 1027-1035
Acetylation of 1,5-anhydro-D-fructose under acidic conditions gave two
crystalline acetylated dimeric forms, which by X-ray analysis were sh
own to be diastereomeric spiroketals formed between C-2 and C-2/C-3. T
he structures of the compounds differed only at the configuration at C
-2. Acetylation or benzoylation of 1,5-anhydro-D-fructose in pyridine
yielded nhydro-4-deoxy-D-glycero-hex-3-enos-2-ulopyra-nose or crystall
ine nzoyl-4-deoxy-D-glycero-hex-3-enos-2-ulo-pyranose.