Tetrose

DErythrose_Fischer.svg

Tetrose

A tetrose is a monosaccharide containing four carbon atoms. The chemical formula for a tetrose is C₄H₈O₄. Tetroses are classified based on the functional group present in the molecule: they can be either aldoses or ketoses.

Types of Tetroses

Tetroses can be divided into two main types:

• Aldotetroses: These have an aldehyde group at the first carbon atom. Examples include:

 * D-Erythrose
 * D-Threose

• Ketotetroses: These have a ketone group at the second carbon atom. An example is:

 * D-Erythrulose

Structure

Tetroses can exist in both linear and cyclic forms. In their linear form, they have a straight-chain structure, while in their cyclic form, they form a ring structure through an intramolecular reaction between the carbonyl group and one of the hydroxyl groups.

Biological Importance

Tetroses play a crucial role in various biochemical pathways. For instance, D-Erythrose-4-phosphate is an intermediate in the pentose phosphate pathway, which is essential for the production of nucleotides and amino acids.

Stereochemistry

Tetroses exhibit stereoisomerism due to the presence of chiral centers. Aldotetroses have two chiral centers, leading to four possible stereoisomers: D-Erythrose, L-Erythrose, D-Threose, and L-Threose. Ketotetroses have one chiral center, resulting in two stereoisomers: D-Erythrulose and L-Erythrulose.

See Also

• Monosaccharide
• Pentose
• Hexose
• Carbohydrate
• Pentose phosphate pathway

External Links

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