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Pyran
 
 
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In chemistry
Chemistry

Chemistry is the science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions....
, a pyran is a six membered heterocyclic ring consisting of five carbon
Carbon

Carbon is a chemical element with chemical symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalence?making four electrons available to form covalent bond chemical bonds....
 atoms and one oxygen
Oxygen

Oxygen no O2 produced; 2) O2 produced, but absorbed in oceans & seabed rock; 3) O2 starts to gas out of the oceans, but is absorbed by land surfaces and formation of ozone layer; 4-5) O2 sinks filled and the gas accumulates]]...
 atom and containing two double bonds. The molecular formula is C5H6O. There are two isomer
Isomer

In chemistry, isomers are compounds with the same molecular formula but different structural formulae. Isomers do not necessarily share similar properties unless they also have the same functional groups....
s of pyran that differ by the location of the double bonds. In 2H-pyran, the saturated carbon is at position 2, whereas in 4H-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.






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In chemistry
Chemistry

Chemistry is the science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions....
, a pyran is a six membered heterocyclic ring consisting of five carbon
Carbon

Carbon is a chemical element with chemical symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalence?making four electrons available to form covalent bond chemical bonds....
 atoms and one oxygen
Oxygen

Oxygen no O2 produced; 2) O2 produced, but absorbed in oceans & seabed rock; 3) O2 starts to gas out of the oceans, but is absorbed by land surfaces and formation of ozone layer; 4-5) O2 sinks filled and the gas accumulates]]...
 atom and containing two double bonds. The molecular formula is C5H6O. There are two isomer
Isomer

In chemistry, isomers are compounds with the same molecular formula but different structural formulae. Isomers do not necessarily share similar properties unless they also have the same functional groups....
s of pyran that differ by the location of the double bonds. In 2H-pyran, the saturated carbon is at position 2, whereas in 4H-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. 4H-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
Tetrahydropyran

Tetrahydropyran, or oxane, is the organic compound consisting of a saturated six-membered ring containing five carbon atoms and one oxygen atom....
. In this context, the monosaccharide
Monosaccharide

Monosaccharides are the most basic unit of carbohydrates. They are the simplest form of sugar and are usually colorless, water-soluble, crystal solids....
s containing a six-membered ring system are known as pyranose
Pyranose

Pyranose is a collective term for carbohydrates which have a chemical structure that includes a six-membered ring consisting of five carbons and one oxygen....
s. Hence, the six-membered ring form of glucose
Glucose

Glucose , a monosaccharide also known as grape sugar, blood sugar, or corn sugar, is a very important carbohydrate in biology....
 is known as D-glucopyranose.

See also


  • Furan
    Furan

    Furan, also known as furane and furfuran, is a Heterocyclic compound organic compound. It is typically derived by the thermal decomposition of pentose-containing materials, cellulosic solids especially pine-wood....