Talose
Structural formula | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fischer projection , open-chain representation | |||||||||||||||||||
General | |||||||||||||||||||
Surname |
|
||||||||||||||||||
other names |
|
||||||||||||||||||
Molecular formula | C 6 H 12 O 6 | ||||||||||||||||||
Brief description |
White dust |
||||||||||||||||||
External identifiers / databases | |||||||||||||||||||
|
|||||||||||||||||||
properties | |||||||||||||||||||
Molar mass | 180.16 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
||||||||||||||||||
Melting point |
133-135 ° C ( D- form) |
||||||||||||||||||
solubility |
soluble in water |
||||||||||||||||||
safety instructions | |||||||||||||||||||
|
|||||||||||||||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Talose is a monosaccharide with six carbon atoms. This sugar belongs to the group of aldohexoses . Talose is the C-2 epimer of galactose (see: family tree of aldoses ). D- Talose occurs naturally - albeit in small quantities - as a component of the antibiotic hygromycins (formed by streptomycetes ).
As with any sugar (except for dihydroxyacetone) there are two enantiomeric forms that behave like an image and a mirror image. Whenever “Talose” is mentioned in this text or in the scientific literature without any additional name ( prefix ), D -Talose is meant.
properties
In aqueous solution, an intramolecular ring closure sometimes occurs, so that an equilibrium is established between the aldehyde form and the two ring forms ( furanose and pyranose ):
D -Talose - spellings Wedge formula Haworth notation
α- D- talofuranose
20%
β- D- talofuranose
11%
α- D -alopyranose
40%
β- D -alopyranose
29%
Individual evidence
- ↑ a b c d e data sheet D-Talose at AlfaAesar, accessed on May 22, 2017 ( PDF )(JavaScript required) .
- ↑ Jürg Hunziker: Carbohydrate Chemistry ( Memento from May 10, 2008 in the Internet Archive ), April 1, 2007.