Ch3

D-Alanine

FIGURE 3-3 Stereoisomerism in a-amino acids. (a) The two stereoisomers of alanine, l- and d-alanine, are nonsuperimposable mirror images of each other (enantiomers). (b, c) Two different conventions for showing the configurations in space of stereoisomers. In perspective formulas (b) the solid wedge-shaped bonds project out of the plane of the paper, the dashed bonds behind it. In projection formulas (c) the horizontal bonds are assumed to project out of the plane of the paper, the vertical bonds behind. However, projection formulas are often used casually and are not always intended to portray a specific stereochemical configuration.

XCHO

L-Glyceraldehyde COO-

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