Ketohexose

A ketohexose is a ketone-containing hexose (a six-carbon monosaccharide). Ketohexoses have three chiral centers, so 8 (2³ = 8) different stereoisomers are possible.

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The 4 D-ketohexoses are:

 CH2OH       CH2OH         CH2OH        CH2OH
 |           |             |            |
 C=O         C=O           C=O          C=O
 |           |             |            |
HC-OH     HO-CH           HC-OH      HO-CH
 |           |             |            |
HC-OH       HC-OH       HO-CH        HO-CH
 |           |             |            |
HC-OH       HC-OH         HC-OH        HC-OH
 |           |             |            |
 CH2OH       CH2OH         CH2OH        CH2OH 
D-Psicose    D-Fructose   D-Sorbose    D-Tagatose