azg
Harmless
Posts: 6
Registered: 3-4-2014
Member Is Offline
Mood: No Mood
|
|
Oxidising alcohols into carboxylic acid with KMnO4
I read on WikiPedia
http://en.wikipedia.org/wiki/Oxidation_of_primary_alcohols_t...
that Potassium Permanganate effectively oxidizes alcohols, di-ols, etc. It also said the reaction is carried out in a suspension or solution of KOH or
NaOH. But the product will react with the base. It said that the reaction can be carried in neutral conditions at a cost of long reaction time.
Also, I read that MnO2 precipitate is formed.
So, do you guys know how much time the reaction will require without strong base ? Is it easy to separate the MnO2 precipitate via
decantation ?
|
|
|
Chemosynthesis
International Hazard
Posts: 1071
Registered: 26-9-2013
Member Is Offline
Mood: No Mood
|
|
Since no one knows what your reaction is, specifically, the answer is "no."
|
|
|
azg
Harmless
Posts: 6
Registered: 3-4-2014
Member Is Offline
Mood: No Mood
|
|
KMnO4 is stirred in alcohols to get respective carboxylic acids. It oxidizes alcohols to get carboxylic acids. Do you know how much time
will this take ?
|
|
|
Chemosynthesis
International Hazard
Posts: 1071
Registered: 26-9-2013
Member Is Offline
Mood: No Mood
|
|
Quote: Originally posted by azg  |
KMnO4 is stirred in alcohols to get respective carboxylic acids. It oxidizes alcohols to get carboxylic acids. Do you know how much time
will this take ? |
That's not a specific reaction with actual reagents. That's a generalized example, so again... no. It's reactant-specific.
|
|
|
DraconicAcid
International Hazard
Posts: 4333
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline
Mood: Semi-victorious.
|
|
| Quote: Originally posted by Chemosynthesis | | Quote: Originally posted by azg |
KMnO4 is stirred in alcohols to get respective carboxylic acids. It oxidizes alcohols to get carboxylic acids. Do you know how much time
will this take ? |
That's not a specific reaction with actual reagents. That's a generalized example, so again... no. It's reactant-specific. |
And temperature dependent. And concentration dependent. And solvent dependent. And, and, and....
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
|
|
|
Chemosynthesis
International Hazard
Posts: 1071
Registered: 26-9-2013
Member Is Offline
Mood: No Mood
|
|
Exactly.
azg, please post with actual reaction conditions or reagents next time, and if not citing peer-reviewed chemical literature, use the "Beginnings"
section.
|
|
|
Nicodem
|
Thread Moved
26-4-2014 at 22:28 |
azg
Harmless
Posts: 6
Registered: 3-4-2014
Member Is Offline
Mood: No Mood
|
|
25% ethanol in water at room temparature ?
|
|
|
Chemosynthesis
International Hazard
Posts: 1071
Registered: 26-9-2013
Member Is Offline
Mood: No Mood
|
|
It appears your answer is in this article.
J. Am. Chem. SOC. 41, 1267 (1919). pp 1267–1285
You may also consider using acidic conditions if possible.
"The oxidation of ethanol by permanganate has been found to obey the rate law v=k[MeCHO][MnO 4 −][H+]"
Reaction Kinetics and Catalysis Letters
1989, Volume 38, Issue 2, pp 313-318
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
