Oxidation of alcohols I: Mechanism and oxidation states | Organic chemistry | Khan Academy
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- čas přidán 7. 09. 2012
- Oxidation of primary alcohols to aldehydes (and then carboxylic acids); oxidation of secondary alcohols to ketones. Created by Jay.
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Organic Chemistry on Khan Academy: Carbon can form covalent bonds with itself and other elements to create a mind-boggling array of structures. In organic chemistry, we will learn about the reactions chemists use to synthesize crazy carbon based structures, as well as the analytical methods to characterize them. We will also think about how those reactions are occurring on a molecular level with reaction mechanisms. Simply put, organic chemistry is like building with molecular Legos. Let's make some beautiful organic molecules!
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7:20 for Mechanism !
You are right about the alpha carbon relating to a carbonyl. Some textbooks will also use it to describe the carbon bearing the hydroxyl group as I did in the video.
Thank you for this. It was very clear and exactly what I needed!
Great video! I just have one question about the oxidation of an aldehyde, If oxidation mechanism consists of losing an alpha hydrogen and gaining an oxygen bond why don't you lose the hydrogen on the aldehyde when we oxidise it ? Thanks
After abstracting the hydrogen atom from the oxygen atom, your alpha carbon would've 5 bonds and that's not possible. So you've to abstract an alpha hydrogen that the alpha carbon obeys the octet rule.
Did u finish school yet?
i love this! love your way of thinking
Thanks so much for posting,it was really helpful..
Good explanation, Thank you sir.
Thank you, sir. Great help
Sir everything is good but in my material they gave that oxidation takes place with tertiary also and forms alkene by using copper.i need explanation about this
Wow thanks 🌹💙
Great Vid! What program did you use to write?!
How do the hydrogens give two electrons to the carbons if they only have one electron to give? Have I misinterpreted something?
Too good
thank youu sir
Thank you so so much
why is the water took the alpha hydrogen?
Someone correct me if I am wrong:
When you put chromate anion together an alcohol, the chromate anion gets reduced and the alcohol gets oxidized, so the "original" chromate ion is consumed as a reactant, and "new" chromate anion is produced. This process will keep going util all or close to all of the "original" chromate ions are used up in most conditions.
+Au Ail cromate is a kation with Oxidation state of 6+, in CrO4^2- ? if i remember right?
It also get reduced yes, into Cr3+.
How can water (weak base ) deprotonate the chromate ether? whats the pka pf the chromate ester?
I also think this step will be less likely to occur, because the pka of the chromate ester should be much higher than the pka of water. Maybe it's an intramolecular proton shift.
now I understand... thanks
interesting points ,if anyone else wants to learn about cure alcohol red face try Pycanta Red Face Protocol (just google it ) ? Ive heard some awesome things about it and my work buddy got cool success with it.
Excellent
Thnks
isnt the oxidation number of the chromium in HCrO3 5+ (2x O=-4 and 1x OH=-1)?
No it's +4, part of the mechanism in the video is missing a curly arrow, HCrO3 has only one chromium-oxygen double bond so it's 1 x Cr=O, 1 x Cr-OH and 1 x Cr-O(-). The chromium (IV) species is itself capable of carrying out further oxidation or 1) disproportionating to Cr(V) and Cr(III) i.e. 2 Cr(V) --> Cr (III) + Cr (V), where Cr(V) can then also serve as an oxidant or 2) itself be oxidized by Cr(VI) i.e. Cr(VI) + Cr(IV) --> 2 Cr(V) where Cr(V) can....you get the picture :).
What happened to the H bonded oxygen pls tell me
probably 'paint' with a digital pen thingie
you can learn anything #