DrMario
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Solubility of phthalic anhydride and resorcinol in sulfuric acid?
Assume: I have access to Sigma-Aldrich chemicals.
Is resorcinol soluble in sulfuric acid? How does sulfuric acid concentration affect said solubility? Vs. temperature?
Same question for phthalic anhydride.
If you have experience with catechol or hydroquinone, share that, too.
Many thanks in advance. Your experience is very valuable!
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Herr Haber
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You'll find a lot of information about resorcinol and it's solubility in H2SO4 at different temperatures if you look for the styphnic acid threads.
And if that's not enough you'll find even more information in Urbanski (Vol I if memory serves).
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DrMario
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Quote: Originally posted by Herr Haber  | You'll find a lot of information about resorcinol and it's solubility in H2SO4 at different temperatures if you look for the styphnic acid threads.
And if that's not enough you'll find even more information in Urbanski (Vol I if memory serves). |
It seems that resorcinol reacts with concentrated H2SO4. Not what I was expecting.
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DrMario
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Basically what I'm trying to do is synthesize fluorescein in the liquid phase.
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Magpie
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Making fluorescein is easy - maybe I don't understand your concerns. I have made small amounts of this beautiful dye by following the directions in
Brewster (forum library).
The single most important condition for a successful synthesis is good mixing - Nicodem
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Amos
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The two reactants melt together rather nicely as they react, even without any sulfuric acid present. The anhydrous ZnCl2 method still produces a
crystal clear dark red liquid. Not sure if that helps.
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DrMario
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| Quote: Originally posted by Amos | The two reactants melt together rather nicely as they react, even without any sulfuric acid present. The anhydrous ZnCl2 method still produces a
crystal clear dark red liquid. Not sure if that helps.
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I need to have the reagents in liquid form and then inject them separately into a container where they will react. That's why I was hoping I can
dissolve them in sulfuric acid first.
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Magpie
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Could you use a solvent. Maybe benzene?
The single most important condition for a successful synthesis is good mixing - Nicodem
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DrMario
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I don't mind using a solvent, but I have no idea how that would then work with sulfuric acid, which is necessary for the reaction to take place.
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DrMario
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Does anyone have insights if I can make this reaction work, be it at low yield, by starting from two solutions? If I wasn't very clear before, my
initial idea was that both reagents could be dissolved in sulphuric acid. I am however open to whatever works.
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unionised
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| Quote: Originally posted by DrMario |
I need to have the reagents in liquid form and then inject them separately into a container where they will react. |
Why?
Edit: Fixed broken quote
[Edited on 1-6-2017 by zts16]
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DrMario
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Bump.
Hoping someone will answer.
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unionised
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Me too.
Why do you need the reactants in liquid form?
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DrMario
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I am still waiting for a constructive answer, and would be grateful to the smart lady or gentleman who might provide it.
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unionised
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You have had several constructive answers that can be summed up as "It won't work because sulphuric acid reacts with resorcinol".
I'm also still waiting for an answer.
Let me know when something changes.
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DrMario
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I'm quoting something I read elsewhere:
I observed that many can't think in an original or creative way. They have their preconceived/biased ideas of how things ought to work, and
advancements that disregard them are accidents. For such people, the natural response to the question "How could X be done?" is "Why would you
want to do X?"
[Edited on 5-2-2017 by DrMario]
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unionised
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OK
You are right- there are people who can only think of things one way.
They have an objective in mind and they think that can achieve that goal by, for example, dissolving 2 chemicals in a third.
They seek others' opinions on the matter.
Unfortunately, it turns out that one of the chemicals reacts with the solvent they had in mind.
And people post to let him know that his proposed method of achieving his objective is impossible.
Then they ask what that the overall objective is, in order to see if they can find a pathway to that goal which is actually possible.
And they get insulted for their trouble.
Let me know when something changes.
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