Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
Enol
(section)
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
== Enediols == Enediols are alkenes with a hydroxyl group on each carbon of the C=C double bond. Normally such compounds are disfavored components in equilibria with [[acyloin]]s. One special case is [[catechol]], where the C=C subunit is part of an aromatic ring. In some other cases however, enediols are stabilized by flanking carbonyl groups. These stabilized enediols are called [[reductone]]s. Such species are important in glycochemistry, e.g., the [[Lobry de Bruyn–Van Ekenstein transformation]].<ref>{{cite journal|title=Reductones |author=Schank, Kurt|journal=Synthesis|year=1972|volume=1972|issue=4|pages=176–90|doi=10.1055/s-1972-21845|s2cid=260331550 }}</ref> :[[File:Keto-Endiol-Tautomerie.svg|thumb|center|350 px|class=skin-invert-image|'''Keto-enediol tautomerizations.''' Enediol in the center; [[acyloin]] isomers at left and right. Ex. is [[hydroxyacetone]], shown at right.]] [[Image:Ascorbic acidity3.png|thumb|center|350 px|class=skin-invert-image|Conversion of [[ascorbic acid]] (vitamin C) to an enolate. Enediol at left, enolate at right, showing movement of electron pairs resulting in deprotonation of the stable parent enediol. A distinct, more complex chemical system, exhibiting the characteristic of [[vinylogy]].]] [[Ribulose-1,5-bisphosphate]] is a key substrate in the [[Calvin cycle]] of [[photosynthesis]]. In the Calvin cycle, the ribulose equilibrates with the enediol, which then binds [[carbon dioxide]]. The same enediol is also susceptible to attack by oxygen (O<sub>2</sub>) in the (undesirable) process called [[photorespiration]]. [[File:EnediolPhotoResp.svg|thumb|center|class=skin-invert-image|Keto-enediol equilibrium for [[ribulose-1,5-bisphosphate]].]]
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)