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smuv
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Probably using a larger excess of base will avoid this side product. You can imagine, that under harsh enough conditions, hydroxide would add into
the a-ketoester, to form the deprotonated acetal. The deprotanated acetal could then go on to add into KMnO4. A mechanism like this is only favored
in strongly basic conditions (notice the orgyn procedure is not using much base, balance the equation and you will see).
Additionally acidic conditions would totally avoid this product, but it is also more likely that you will get cleavage of you phthalic acid product
under these conditions.
One thing that comes to mind, is it may be possible to produce phthalic anhydride from xylenes (mixed isomers) by oxidizing the xylene, and
sublimating the product. I assume that the phthalic anhydride formed has a much higher vapor pressure than either iso or terephthalic acid. This
difference in vapor pressures may provide a means of isolating only phthalic anhydride from this mixture.
"Titanium tetrachloride…You sly temptress." --Walter Bishop
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Takron
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Quote: Originally posted by smuv  |
...it may be possible to produce phthalic anhydride from xylenes (mixed isomers) by oxidizing the xylene, and sublimating the product...
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Would this be achieved like the oxidation of toluene to benzoic acid and MnO2? Xylene and KMnO4 combined and refluxed together and then filtered with
drying then sublimate it out?
Would you have any ideas for a decent but not too exotic phase transfer catalyst for these reactions? I thought maybe a little bit of detergent or
cascade or something but I figured something better must exist.
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Chemistry Alchemist
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I said in a previous post about a a stoichiometry calculator but hadn't found a crack or patch for it, well i think i have cracked it... on this
website below alot of shizz there is a button saying Get Crack, click on it, will start downloading a rar. and just extract to desktop or where ever
you want it, im 90% sure its the full version, looks like it to me because i could never be able to save data on it  great tool for amateurs like me
http://cracks.bz/download_EBAS.1.0.1.63.cracked-SND_crack_se...
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Takron
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Dude that site looks like a virus hotbed.
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Chemistry Alchemist
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i checked it out and its fine, no viruses found, u dont have to do it, just a site i found with a crack that works, its VERY hard to find a patch for
a program that isnt that popular compared to other software i have tried to crack
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Nicodem
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There is no need to crack anything. EniG. Chemistry Assistant is a calculator that can parse empirical formulas and treat them as MW. It is a freeware and very good with an easy
interface. It also has a gadget to calculate the amounts required for preparing solutions of many inorganic and a few organic reagents with the
density tables integrated.
…there is a human touch of the cultist “believer” in every theorist that he must struggle against as being
unworthy of the scientist. Some of the greatest men of science have publicly repudiated a theory which earlier they hotly defended. In this lies their
scientific temper, not in the scientific defense of the theory. - Weston La Barre (Ghost Dance, 1972)
Read the The ScienceMadness Guidelines!
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Chemistry Alchemist
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Thanks, I'll check that out when it's morning time
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Neil
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http://www.sciencemadness.org/talk/viewthread.php?tid=6573
"...phthalic anhydride from naphthalene"
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Chemistry Alchemist
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Ok so i was ment to get some glassware from Panchie but he still hasn't u2u'd me to say hes posted it, so i was wondering, could i use stainless steel
pot with lid to boil the Naphthalene with eh Potassium Permanganate? or would the stainless steel do something to the reaction?
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Nicodem
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Given you provide no reference, I can only guess you are talking about the synthesis of phthalaldehydic acid as described in Org. Synth.?
| Quote: Originally posted by Chemistry Alchemist | | Ok so i was ment to get some glassware from Panchie but he still hasn't u2u'd me to say hes posted it, so i was wondering, could i use stainless steel
pot with lid to boil the Naphthalene with eh Potassium Permanganate? or would the stainless steel do something to the reaction?
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Neglecting the obvious problem of oxidative corrosion, how the hell are you going to reflux in a pot with a lid? (And why would you want to do that!?)
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Chemistry Alchemist
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Dude, I'm just asking a simple question which needs a yes or no explination... What's going to be so corrosive in the reaction? I just really want to
do this reaction!
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Neil
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Nicodem is actually being very nice to you, though it may seem back handed.
I think his answer would best be paraphrased as; No.
If you can not reflux the pot then the question of corrosion is largely superfluous. The lid is not going to work as a reflux.
Google offers this, and many other tantalizing titbits;
"In neutral and alkaline solutions, sodium permanganate is not corrosive to iron, mild steel or stainless steel. However, chloride corrosion of metals
may be accelerated when an oxidant such as F2PP-98 Potassium Permanganate is present in solution. Plastics such as polypropylene, polyvinyl chloride
Type I (PVC I), epoxy resins, fiberglass reinforced plastic (FRP) and TFE, and Tefzel EFTE are best. Refer to Material Compatibility Chart."
http://www.hepure.com/potassium-permanganate.html
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Chemistry Alchemist
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Sorry if I took it the wrong way, I was really just looking for a yes or no answer anyway
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