Welcome Guest Search | Active Topics |

Tag as favorite
Sugars
Options
Previous Topic Next Topic
Natasha_4902
#1 Posted : Thursday, July 30, 2020 11:45:38 PM
Rank: Advanced Member

Groups: Registered
Joined: 6/8/2020
Posts: 62

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

How do you know which OH in a sugar will attach the carbonyl? Why doesn't the OH at the very bottom attack (the one beside the CH2)?

Thank you
Back to top
Report?
INSTR_Katerina_102
#2 Posted : Tuesday, August 04, 2020 10:10:57 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 Natasha,

Generally we know that sugars like to form 5 and 6 member rings, as these are the most themodynamically favored. Knowing more than this is beyond the scope of the MCAT.

As a result, the terminal CH2OH at the bottom generally does not attack to form sugars as this would result in a disfavored 7 member ring.

Please let me know if you'd like more clarification.

Katt
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 0.074 seconds.