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Dolbier HW Solutions 615

Dolbier HW Solutions 615 - 709 CARBOHYDRATES(f 25.15 H...

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( f ) Amylose is a polysaccharide. Its glycoside linkages are inert to Benedict s reagent, but the ter- minal glucose residues at the ends of the chain and its branches are hemiacetals in equilibrium with open-chain structures. A positive test is expected. 25.15 Because the groups at both ends of the carbohydrate chain are oxidized to carboxylic acid functions, two combinations of one CH 2 OH with one CHO group are possible. L -Gulose yields the same aldaric acid on oxidation as does D -glucose. 25.16 In analogy with the D -fructose - D -glucose interconversion, dihydroxyacetone phosphate and D -glyceraldehyde 3-phosphate can equilibrate by way of an enediol intermediate. 25.17 ( b ) The points of cleavage of D -ribose on treatment with periodic acid are as indicated. Four moles of periodic acid per mole of D -ribose are required. Four moles of formic acid and
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