A ketohexose is a hexose with a keto group on one end. Ketohexose is a monosaccharide consisting of six carbon atoms and a ketone group.

The Ketohexoses have three chiral centres ("asymmetric carbon atoms") and so 8 different stereoisomers are possible.

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-Piscose D-Fructose D-Sorbose D-Tagatose

Carbohydrates

Ketohexose