Apiose is one of several naturally occurring carbohydrates characterized by a br

Question

Apiose is one of several naturally occurring carbohydrates characterized by a branched carbon chain and is conveniently isolated as the compound shown (“diacetone apiose”).

Based on the observation that the protons at C1 and C2 have a coupling constant of 3.7 Hz, choose the correct statement.

a. The protons at C1 and C2 are anti

b. The dihedral angle between H-C1-C2-H is in the range of 145 – 165°

c. The protons at C1 and C2 are perpendicular

d. The protons at C1 and C2 are eclipsed

e. The dihedral angle between H – C1 – C2 – H is in the range of 30 – 60°

f. None of the statements are correct

Explanation / Answer

Apiose is one of several naturally occurring carbohydrates characterized by a br

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