What is the structure of ketohexose?

A ketohexose is a ketone-containing hexose Biologically, the most important example is fructose. In the linear form, the 2-ketohexoses have three chiral centers and therefore eight possible stereoisomers (23), comprising four pairs of enantiomers.

What is the example of ketohexose?

A ketohexose, in contrast, is a hexose with a ketone functional group located in position 2. Aldohexoses have four chiral centers. Because of that there are 16 possible stereoisomers. Examples of aldohexoses are glucose, mannose, galactose, gulose, idose, talose, allose, and altrose.

What is the structure of Aldohexose?

Glucose (also known as dextrose) is a carbohydrate compound consisting of six carbon atoms and an aldehyde group and they are referred to as aldohexose. The glucose structure can exist in an open-chain (acyclic) and ring (cyclic) form.

Which is an example of a ketohexose compound?

In its linear structure, a ketohexose contains the carbonyl carbon center at the position 2 or 3. Therefore, in the linear structure, a ketohexose contains three chiral centers and eight possible stereoisomers. This means four pairs of enantiomers are possible for this compound. D-fructose is a common example of ketohexoses.

What’s the difference between ketohexose and fructose?

In biological applications, the most common and important ketohexose is fructose. In its linear structure, a ketohexose contains the carbonyl carbon center at the position 2 or 3. Therefore, in the linear structure, a ketohexose contains three chiral centers and eight possible stereoisomers.

How many stereoisomers are in a 2-ketohexose linear form?

In the linear form, the 2-ketohexoses have three chiral centers and therefore eight possible stereoisomers (2 3 ), comprising four pairs of enantiomers. The four D -isomers are: The corresponding L forms have the hydroxyls on carbons 3, 4,and 5 reversed. Below are depiction of the eight isomers in an alternative style:

What’s the difference between aldohexose and keto hexose?

The key difference between aldohexose and ketohexose is that aldohexoses contain a formyl group whereas ketohexoses contain a ketone group. Moreover, when considering the position of the carbonyl carbon in these compounds, aldohexose contains a carbonyl carbon at position 1 while ketohexose contains a carbonyl carbon at position 2 or 3.