BenZeen
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(Diggers) toluene Inhibitors?
Hi everyone,
I have been playing around with the MAA cell (cycloknights variation) and have managed to get as far as generating the brown oxidative substance,
after adding 100 - 150 mls of toluene i can smell a very faint amount of benzaldehyde, attempts to isolate anything meaningful has proved completely
futile. (cell is 2 ltrs)
I have tried strong stirring, increase temp etc but to no avail, which has led me to believe there may be something in the toluene preventing it from
becoming benz. I remember something about thiotoluenes inhibiting benzaldehyde formation, so simply i just would like to hear any ideas or comments
regarding commercial toluene that may affect this reaction.
Thankyou very much
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Panache
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Mood: Instead of being my deliverance, she had a resemblance to a Kat named Frankenstein
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Do you have the msds of the product, this will let you know if anything is in the toluene, after that you can begin speculating, rather than
speculating upon a speculation.
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smuv
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Is thiophene(s) even an impurity any more? Back in the day, sure, aromatics came from coal pyrolysis. Now, aromatics are petrochemicals, I have a
hard time fathoming thiophene would make its way into even tech grade chemicals these days.
"Titanium tetrachloride…You sly temptress." --Walter Bishop
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not_important
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Not really, SFAIK most toluene is derived from petroleum (as you said). I believe the main impurity in commercial toluene is the corresponding
methyl-cyclohexane and cyclohexenes, as their boiling points are close to that of toluene. Dilute KMnO4 or bromine water will test for non-aromatic
unsaturates easy enough. Thioaromatics can be oxidised to sulfonones by H2O2 or other oxidisers, distillation would remove those.
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BenZeen
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Thanks guys, Always good to hear from more knowlegable chemists than I.
Perusing the interweb, I came across this pdf from the iupac detailing methods for purification of benzene and toluene.
www.iupac.org/publications/pac/1989/pdf/6110x1823.pdf
I thought it might be worth posting incase this thread pops up at some future date in the FSE.
Cheers, Benzeen.
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Sedit
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Iv said it before, try dripping the oxidizer into warm toluene with good stirring. Else your just wasting your time.
Knowledge is useless to useless people...
"I see a lot of patterns in our behavior as a nation that parallel a lot of other historical processes. The fall of Rome, the fall of Germany — the
fall of the ruling country, the people who think they can do whatever they want without anybody else's consent. I've seen this story
before."~Maynard James Keenan
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