Threose

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Threose[1]
D-threose.svg
D-Threose
L-threose.svg
L-Threose
Identifiers
CAS number 95-43-2 (D) N, 95-44-3 (L) YesY
PubChem 439665 (D)
ChemSpider 388736 YesY
ChEBI CHEBI:28587 YesY
Jmol-3D images Image 1
Image 2
Properties
Molecular formula C4H8O4
Molar mass 120.10 g mol−1
Appearance Syrup
Solubility in water Very soluble
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Threose is a four-carbon monosaccharide or carbohydrate with molecular formula C4H8O4. It has a terminal aldehyde group rather than a ketone in its linear chain, and so is considered part of the aldose family of monosaccharides. The threose name can be used to refer to both the D- and L-stereoisomers, and more generally to the racemic mixture (D/L-, equal parts D- and L-) as well as to the more generic threose structure (absolute stereochemistry unspecified).

The prefix "threo" which derives from threose (and "erythro" from a corresponding diastereomer erythrose) offer a useful way to describe general organic structures with adjacent chiral centers, where "the prefixes... designate the relative configuration of the centers".[2] As is depicted in a Fischer projection of D-threose, the adjacent substituents will have a syn orientation in the isomer referred to as "threo", and are anti in the isomer referred to as "erythro".[3]

Fischer projections depicting the two enantiomers of threose

See also[edit]

References[edit]

  1. ^ Merck Index, 11th Edition, 9317
  2. ^ Formulas Using Other Configurational Notations, W. Rausch, accessed 1 March 2011
  3. ^ ibid. Prof. Rausch helpfully notes that the prefixes "may be applied to racemic compounds, as well as pure enantiomers and meso compounds", and that when depicted in the common "zig-zag" representation, adjacent "substituents may lie on the same side of the carbon chain... [syn] or on opposite sides... [anti]", which is opposite of their depiction in a Fischer projection.