Structure and systematic name

Trehalose (Problem 25.58) is cleaved by enzymes that hydrolyze a-glycosides but not by enzymes that hydrolyze /3-glycosides. What is the structure and systematic name of trehalose ... 

Trehalose is a nonreducing disaccharide (C12H22O11) isolated from the poisonous mushroom Amanita muscaria. Treatment with an a-glucosidase converts trehalose to two molecules of glucose, but no reaction occurs when trehalose is treated with a j3-glucosidase. When trehalose is methylated by dimethyl sulfate in mild base and then hydrolyzed, the only product is 2,3,4,6-tetra-O-methylglucose. Propose a complete structure and systematic name for trehalose. 

Figure 1 shows the structures and systematic names of representative three-membered rings and Figure 2 shows the structures and systematic names of representative four-membered rings. 

A series of similar surfactant molecules, which differ only in the length and composition of a linking unit, was investigated. The chemical structures and systematic names of the molecules are shown in Table 4.1. For a simplified handling, the surfactant molecules are denoted with the abbreviations given in Table 4.1. 

FIG. 1. Structure and systematic names of the anabolic steroid drugs screened. 

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