The most ancient classification of enantiomers refers to (+)-D-glyceraldehyde and (—)-L-glyceraldehyde as standards for the D/L-nomenclature (Fig. 2.7). Any enan-tiomerically pure compound that could be related by chemical transformation processes to (+)-D-glyceraldehyde is categorized as D-enantiomer, and any compound that corresponds to (—)-L-glyceraldehyde is categorized L-enantiomer. Today, D and l prefixes are only used for amino acids and sugars, since the process of
Fig. 2.7 Chemical structures of (—)-l-glyceraldehyde (left) and (+)-d-glyceraldehyde (right) used for labelling d- and l-enantiomers denominating D or L by often complex and multiple chemical transformation processes is habitually slow and work-intensive.
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