Talk:Ketose
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[edit] Ketose reducing?
Why are ketoses reducing? What I am usually told is that the carbonyl group cutting through a carbon chain is no reducing.......
plx give me the mechanism... —Preceding unsigned comment added by 58.152.219.35 (talk) 12:24, 14 March 2007
- I believe since ketoses contain a carbonyl group, which are highly acidic, acts a hydrogen donor reducing its corresponding acceptor. LostLucidity (talk) 17:39, 12 March 2008 (UTC)
- 58.152.219.35, I think you are referring to either Tollens' test or the Fehling test, both of which are performed in a basic reagent. In these circumstances ketoses can be converted to aldoses (this is called the Lobry-de Bruyn-van Ekenstein transformation). In the case of D-fructose you get D-glucose and D-mannose. Finally, these aldoses are easily reduced. Per Le Châtelier's principle almost all of the sugar will react, i.e. the test succeeds. This is what I have been taught. --62.224.90.35 (talk) 00:00, 9 April 2008 (UTC)
