The Aldose Form

On this page the D-aldoses up to the hexoses are shown. There is only one D-triose, two D-tetroses, four D-pentoses, and eight D-hexoses. Structures in different rows will have a different number of CHOH groups. Any two structures within the same row (except for trioses) of D-aldoses will be diastereomers.

D-glyceraldehyde L-glyceraldehyde

The simplest aldose is glyceraldehyde. Glyceraldehyde (also called glycerose) is a three-carbon aldose (triose). With one asymmetric center there are only two stereoisomers. This pair of stereoisomers are the enantionmers D- and L-glyceraldehyde. The D/L designation of all other carboydrates is based upon its similarity to the stereocenter in glyceraldehyde. If the highest numbered asymmetric carbon of a monosaccharide matches that of D-glyceraldehyde, then the saccharide is also of the D- configuration. In the chart below, the highest asymmetric carbon is towards the bottom with the aldehyde beginning as '1'.

D-Aldose Structures

D-erythose D-threose
D-ribose D-arabinose D-xylose D-lyxose
D-allose D-altrose D-glucose D-mannose D-gulose D-idose D-galactose D-talose

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