Hexoses: Difference between revisions

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== Fructose ==

The applet on the right shows D-fructose in a conformation in which the oxygen of C-5 is in position to react with C-2, the carbonyl carbon, forming a hemiketal<ref>[http://en.wikipedia.org/wiki/Hemiacetal Hemiketal]</ref>. As in the case of glucose forming a hemiacetal what was the carbonyl carbon becomes a chiral carbon and becomes an anomeric carbon. The two anomers are called α-D-fructofuranose<ref>[http://en.wikipedia.org/wiki/Furanose Furanose]</ref> and β-D fructofuranose. The ~~reaction with the oxygen of C-5 forming a five membered ring is preferred over the reaction with the oxygen on C-6 which would form a six membered ring~~.

The applet on the right shows D-fructose in a conformation in which the oxygen of C-5 is in position to react with C-2, the carbonyl carbon, forming a hemiketal<ref>[http://en.wikipedia.org/wiki/Hemiacetal Hemiketal]</ref>. As in the case of glucose forming a hemiacetal what was the carbonyl carbon becomes a chiral carbon and becomes an anomeric carbon, but the reaction with the oxygen of C-5 is preferred over the reaction with the oxygen on C-6 forming a five membered ring instead of a six membered ring. The two anomers are called α-D-fructofuranose<ref>[http://en.wikipedia.org/wiki/Furanose Furanose]</ref> and β-D fructofuranose. The α and β furanoses are shown below.

The α anomer

== Terms Defined in Wikipedia ==

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 == Fructose ==
-The applet on the right shows D-fructose in a conformation in which the oxygen of C-5 is in position to react with C-2, the carbonyl carbon, forming a hemiketal<ref>[http://en.wikipedia.org/wiki/Hemiacetal Hemiketal]</ref>. As in the case of glucose forming a hemiacetal what was the carbonyl carbon becomes a chiral carbon and becomes an anomeric carbon. The two anomers are called α-D-fructofuranose<ref>[http://en.wikipedia.org/wiki/Furanose Furanose]</ref> and β-D fructofuranose. The reaction with the oxygen of C-5 forming a five membered ring is preferred over the reaction with the oxygen on C-6 which would form a six membered ring.
+The applet on the right shows D-fructose in a conformation in which the oxygen of C-5 is in position to react with C-2, the carbonyl carbon, forming a hemiketal<ref>[http://en.wikipedia.org/wiki/Hemiacetal Hemiketal]</ref>. As in the case of glucose forming a hemiacetal what was the carbonyl carbon becomes a chiral carbon and becomes an anomeric carbon, but the reaction with the oxygen of C-5 is preferred over the reaction with the oxygen on C-6 forming a five membered ring instead of a six membered ring. The two anomers are called α-D-fructofuranose<ref>[http://en.wikipedia.org/wiki/Furanose Furanose]</ref> and β-D fructofuranose. The α and β furanoses are shown below.
   {{clear}}
+<Structure load='Alpha fructose.pdb' size='400' frame='true' align='left' caption='' scene='Hexoses/Alpha_fructose/1' />
+<Structure load='Beta fructose.pdb' size='400' frame='true' align='right' caption='' scene='Hexoses/Beta_fructose/1' />
+The α anomer
+{{clear}}
 == Terms Defined in Wikipedia ==
    {{Reflist}}