Pyran

Chembox new
ImageFileL1=2H-Pyran.pngImageSizeL1=75px
ImageFileR1=Pyran3d.pngImageSizeR1=100px
ImageFileL2=4H-Pyran.pngImageSizeL2=75px
ImageFileR2=4HPyran3d.pngImageSizeR2=100px
IUPACName=Pyran
OtherNames=2"H"-Pyran, 4"H"-Pyran
Section1= Chembox Identifiers
CASOther= [31441-32-4] (2"H")
[289-65-6] (4"H")
PubChem=
SMILES=C1=CC=CCO1 (2"H")
C1=CCC=CO1 (4"H")
Section2= Chembox Properties
Formula=C₅H₆O
MolarMass=82.1 g/mol
Appearance=
Density=
MeltingPt=
BoilingPt=
Solubility=
pKa =
pKb =
Section3= Chembox Hazards
MainHazards=
FlashPt=
Autoignition=
Section8 = Chembox Related
OtherCpds = Dihydropyran
Tetrahydropyran

In chemistry, a pyran is a six membered heterocyclic ring consisting of five carbon atoms and one oxygen atom and containing two double bonds. The molecular formula is C₅H₆O. There are two isomers of pyran that differ by the location of the double bonds. In 2"H"-pyran, the saturated carbon is at position 2, whereas in 4"H"-pyran, the saturated carbon is at position 4.

Although the pyrans themselves have little significance in chemistry, a variety of their derivatives are important biological molecules. 4"H"-Pyran easily disproportionates to the corresponding dihydropyran and the pyrylium ion which is easily hydrolyzed in aqueous medium.

The term pyran is also often applied to the saturated ring analog which is more properly referred to as tetrahydropyran. In this context, the monosaccharides containing a six-membered ring system are known as pyranoses. Hence, the six-membered ring form of glucose is known as D-glucopyranose.

See also

* Furan