is it possible to replace chloroform?
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is it possible to replace chloroform?
is it possible to replace chloroform?
I guess what I'm really wondering about is the stochiometry of this reaction. In other write-ups of the bayer-williger I can't seem to find this enormous amounts of GAA. Can somebody help me with the rationale? I'm really close to trying this one out, but the amount of GAA is problematic.
I guess what I'm really wondering about is the stochiometry of this reaction. In other write-ups of the bayer-williger I can't seem to find this enormous amounts of GAA. Can somebody help me with the rationale? I'm really close to trying this one out, but the amount of GAA is problematic.
I would not be lying if I said I know almost nothing about BV oxidation.
Right now I'm doing research to increase the yields during oxidation before I try anything. The best I've understood so far is that the reason why the yields stays around 35% is because of the amount of water in the reaction mass during oxidation.
As for the distillation, yes. It's like distilling essential oils. I assume it can be done the way you said, but it will take too long. It's definitely not practical. When P2P is refluxed (boiling), the external steam volume has to be greater than the steam volume in the reaction flask where the P2P is refluxed. You can get the required steam volume with a pressure cooker.
But you certainly don't need anything fancy like pressure cooker. A very simple setup will do the trick.
I noticed, that I got 30,5 grams of acetoxyphenylpropene from 55 grams of MPB, when I made the peracid, not "in-situ", but first I made it comparing to exact moles, and left the peracid in my closed for 3,5 days with, of course the H2SO4-catalyst. Then I neutralized the solution with sodiumbicarbonate to pH:7. Those are the tricks for getting even decent amount of acetoxy. Don't be fooled those "in-situ"-preparations if you're doing a scale of 10-50 grams of it.
But I have a question. Again. Because I'm also learning, and this is, I think 23 to 24:th attempt!
So, the question is: Now I'm doing the base hydrolyzation of acetoxyphenylpropene to P2P.
The solution must be neutralized when the hydrolyzation is over. I'm out of GAA. Can I use my formic acid to neutralize the soluition, or even hydrochloric acid?
You don't need to use glacial acetic acid. You can use white vinegar from the supermarket.
I'll synthesize oxone by neutralizing Caro's acid. But DMF has to be used as solvent, which is very expensive in my country. Maybe I can follow the peracid method you mentioned.
It worked, I neutralized it with formic acid. Now I'm distilling the ethyl acetate from ethyl acetate/P2P-mixture.
Then I will purify it and extract it again with ethyl acetate, because I can distill with atmosf pressure the ethyl acetate away again, leaving my P2P in the flask.
Do you think that P2P is then pure enough to perform Leuckart reaction?
If you can't distill it but P2P looks as clear as sunflower oil, I see no reason not to try it.
I have washed my P2P 2 times, and it is still red coloured when all of it (~20 ml) it sits in my measuring flask.
When it was in my pyrex dish, it was clear coloured, and when it was stuck in the instrument I was taking it out it was yellow coloured.
Is this normal? It is in oil form, and the smell is very honey-like.
When I introduce hydrogen chloride, it also turns red
When I re-watched the P2P steam distillation video in here. I noticed the impure P2P looks exactly like mine. So, I just have to distill it, because I don't want to fail in the Leuckart-reaction, because this MEK + benzaldehyde to P2P is a lot of work. A LOT. I'm going to distill it at normal atmospheric pressure. I've noticed many chemists in one popular forum talking they've distilled P2P in normal pressure, without any problems. Uncle Fester, who's books I read, says it will decompose, but it is time to try it.
When I re-watched the P2P steam distillation video in here. I noticed the impure P2P looks exactly like mine. So, I just have to distill it, because I don't want to fail in the Leuckart-reaction, because this MEK + benzaldehyde to P2P is a lot of work. A LOT. I'm going to distill it at normal atmospheric pressure. I've noticed many chemists in one popular forum talking they've distilled P2P in normal pressure, without any problems. Uncle Fester, who's books I read, says it will decompose, but it is time to try it.
From now on I will further discuss my Leuckart in appropriate forum. If I fail, or got anything new to share with you with this synthesis, my dear community here, I'll be back.
When I re-watched the P2P steam distillation video in here. I noticed the impure P2P looks exactly like mine. So, I just have to distill it, because I don't want to fail in the Leuckart-reaction, because this MEK + benzaldehyde to P2P is a lot of work. A LOT. I'm going to distill it at normal atmospheric pressure. I've noticed many chemists in one popular forum talking they've distilled P2P in normal pressure, without any problems. Uncle Fester, who's books I read, says it will decompose, but it is time to try it.
This is normal, the fact that it becomes red. With recrystallization with ethanol, this can be purified
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