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 b@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 andsystematic name for trehalose.

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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 b@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.

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