Allose

Structural formula
	Fischer projection , open-chain representation
General
Surname	Allose
other names	6- (hydroxymethyl) oxane-2,3,4,5-tetrol
Molecular formula	C 6 H 12 O 6
Brief description	white solid
External identifiers / databases
EC number	219-994-4
ECHA InfoCard	100.018.178
PubChem	102288
ChemSpider	92408
Wikidata	Q423216
properties
Molar mass	180.16 g mol −1
Physical state	firmly
Melting point	143-146 ° C
solubility	soluble in water
safety instructions
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: no P-phrases
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

The allose is one of the monosaccharides (single sugar , a type of carbohydrate ). Allose is a hexose , which means it has six carbon atoms. Like all hexoses, it has the empirical formula C ₆ H ₁₂ O ₆ . It is stereoisomeric to glucose and belongs to the subgroup of aldohexoses , the reducing " aldehyde sugar ".

The assignment to the D form (dexter: right) or L form (laevus: left) is based on the arrangement of the secondary OH group in the Fischer projection on the chiral C atom number 5. If in this text or in the scientific one Literature "Allose" is mentioned without any additional name ( prefix ), D -Allose is meant. L -Allose is of only marginal importance.

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 form and pyranose form), whereby the allose is then almost exclusively in the pyranose form:

D -Allose - spellings
Wedge formula	Haworth notation
	α- D -allofuranose 5%	β- D -allofuranose 7%
	α- D -allopyranosis 18%	β- D -allopyranosis 70%

Individual evidence

↑ ^a ^b ^c ^d ^e data sheet beta-D-Allose, 98% at AlfaAesar, accessed on June 21, 2019 ( PDF )(JavaScript required) .
↑ Jürg Hunziker: Carbohydrate Chemistry ( Memento from May 10, 2008 in the Internet Archive ), April 1, 2007.

Web links

Commons : Allose - collection of images, videos and audio files

[Alfa-1] ↑ ^a ^b ^c ^d ^e data sheet beta-D-Allose, 98% at AlfaAesar, accessed on June 21, 2019 ( PDF )(JavaScript required) .

[UNI-Bern-2] Jürg Hunziker: Carbohydrate Chemistry ( Memento from May 10, 2008 in the Internet Archive ), April 1, 2007.