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In organic chemistry, pyranose is a collective term for saccharides that have a chemical structure that includes a six-membered ring consisting of five carbon atoms and one oxygen atom (a heterocycle). There may be other carbons external to the ring.
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Ribose can either be a five membered ring or a six membered ring . The furanose form is more useful for cells, as it can be used in other reactions. For most cells, ribose is transported into the cell in the pyranose form. With this said, D-Ribose Pyranase needs to be present to convert the pyranose form into the furanose form.
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The reaction turns the =O group into a hydroxyl, and the hydroxyl into an ether bridge (−O−) between the two carbon atoms, thus creating a ring with one oxygen atom and four or five carbons. If the cycle has five carbon atoms (six atoms in total), the closed form is called a pyranose, after the cyclic ether tetrahydropyran, that has the ...
In chemistry, pyran is a six-membered heterocyclic, non-aromatic ring, consisting of five carbon atoms and one oxygen atom and containing two double bonds. The molecular formula is C 5 H 6 O. There are two isomers of pyran that differ by the location of the double bonds.
Mannose commonly exists as two different-sized rings, the pyranose (six-membered) form and the furanose (five-membered) form. Each ring closure can have either an alpha or beta configuration at the anomeric position. The chemical rapidly undergoes isomerization among these four forms. [citation needed]
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