25.21Begin the problem by converting the Fischer projection of D-ribose to a perspective view. Remem-ber that the horizontal lines of a Fischer projection represent bonds coming toward you, and the ver-tical lines are going away from you.Rank the groups attached to each stereogenic center. Identify each stereogenic center as either RorSaccording to the methods described in Chapter 7. Remember that the proper orientation of the low-est ranked group (usually H) is away from you. Molecular models will be helpful here. Each of thestereogenic centers in D-ribose has the Rconfguration. The IUPAC name of D-ribose is (2R,3R,4R)-2,3,4,5-tetrahydroxypentanal.25.22(a)The Lsugars have the hydroxyl group to the left at the highest numbered stereogenic center in
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