Anhydro Derivatives of Aldoheptoses and Higher Aldoses

The basic skeleton of these anhydrides, l,6-dioxabicyclo[3.2.1]octane, is identical to that of 1,6-anhydrohexopyranoses (see Section II.4). For the 32 diastereoisomeric aldoheptoses, three different types of anhydrides may be formed in acid solution 1,6-anhydropyranoses, 1,6-anhydrofuranoses, 

A multistep synthesis of a branched-chain 1,6-anhydro-D-glycero-D-gluco-253 from D-glucose has been reported. l,6-Anhydro-2,3- 

---