Welcome Guest Search | Active Topics |

Tag as favorite
Reducing Sugars
Options
Previous Topic Next Topic
Angelo_2991
#1 Posted : Sunday, July 05, 2020 9:00:39 PM
Rank: Newbie

Groups: Registered
Joined: 5/19/2020
Posts: 1

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hello,

I believe that I understand what reducing sugars are; they are either cyclic hemiacetals or the open chain aldeydes that can be oxided. My confusion comes from how ketones can act as reducing sugars, when we know that ketones cannot be further oxidized. The CC mentions how they must tautomerize to an aldehyde first, but i cannot wrap my head around how a ketone can tautomerize to an aldeyhde. Can anyone help explain how this works?
Back to top
Report?
INSTR_Katerina_102
#2 Posted : Monday, July 06, 2020 3:58:05 PM
Rank: Advanced Member

Groups: Registered
Joined: 6/24/2019
Posts: 250

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi,

Ketones tautomerizing to aldehydes is an overall process that you only really see for sugars as they need to have an alcohol alpha to the ketone for this to work.

I have drawn an example here, but essentially what you make is an enol that has two alcohols - this can tautomerize two ways, back to a ketone or to an aldehyde - in this way, you can shift where the aldhyde and ketone are.

https://ibb.co/Cnppcgb

Please let me know if this is unclear.
Back to top
Report?
Users browsing this topic
Guest
Tag as favorite
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Clean Slate theme by Jaben Cargman (Tiny Gecko)
Powered by YAF | YAF © 2003-2009, Yet Another Forum.NET
This page was generated in 0.079 seconds.