| Pages:
1
..
3
4
5
6
7
..
104 |
bbartlog
International Hazard
Posts: 1139
Registered: 27-8-2009
Location: Unmoored in time
Member Is Offline
Mood: No Mood
|
|
Seems like you'd first need to hydrolyze it to monomers, and then convert it to dioxane via some means such as heating with sulfuric acid. Those
individual steps should be easy enough to research, I know that the latter at least has been discussed on this forum.
The less you bet, the more you lose when you win.
|
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
Question
would calcium hydroxide work for a base catalysed hydrolysis of acetylsalicyclic acid to salicyclic acid?
is there any way to know when the reaction has come to completion?
|
|
|
UnintentionalChaos
International Hazard
Posts: 1454
Registered: 9-12-2006
Location: Mars
Member Is Offline
Mood: Nucleophilic
|
|
Quote: Originally posted by confused  | would calcium hydroxide work for a base catalysed hydrolysis of acetylsalicyclic acid to salicyclic acid?
is there any way to know when the reaction has come to completion?
|
Boiling water is enough to get the decomposition going, so I'm going to say "yes."
Department of Redundancy Department - Now with paperwork!
'In organic synthesis, we call decomposition products "crap", however this is not a IUPAC approved nomenclature.' -Nicodem
|
|
|
Lambda-Eyde
National Hazard
Posts: 860
Registered: 20-11-2008
Location: Norway
Member Is Offline
Mood: Cleaved
|
|
If I'm going to guess, calcium salicylate won't be very soluble. Boiling water works, but adding a few drops HCl speeds it up and makes the workup
easier.
This just in: 95,5 % of the world population lives outside the USA
Please drop by our IRC channel: #sciencemadness @ irc.efnet.org
|
|
|
I Like Dots
Hazard to Self
Posts: 69
Registered: 10-4-2013
Member Is Offline
Mood: frisky
|
|
Where can I find general a procedure on forming ketone and aldehyde sodium bisulfite adducts?
http://www.erowid.org/archive/rhodium/chemistry/eleusis/bisu... This is the closest I have gotten.
I plan on separating the benzaldehyde from almond extract. Im going to try with acetone also.
|
|
|
SHADYCHASE54
Hazard to Others
Posts: 150
Registered: 16-12-2010
Location: CaNaDay!
Member Is Offline
Mood: No Mood
|
|
I have a quick question regarding removing the acetyl group from n-acetyl-4-piperidone what I am wondering is were I to reflux with a slight molar
excess of potassium hydroxide will I shed the acetyl leaving the 4-piperidone in tact? If you have any experience I would love to hear from you as
well if you might have any pertinent refs all aid would be appreciated.
|
|
|
plante1999
International Hazard
Posts: 1936
Registered: 27-12-2010
Member Is Offline
Mood: Mad as a hatter
|
|
Does anyone know where I can find a good preparation for:
Diethyl azodicarboxylate
Thanks!
I never asked for this.
|
|
|
plante1999
International Hazard
Posts: 1936
Registered: 27-12-2010
Member Is Offline
Mood: Mad as a hatter
|
|
You can see it here, thanks me latter:
http://www.orgsyn.org/Content/pdfs/procedures/CV4P0411.pdf
I never asked for this.
|
|
|
Pyro
International Hazard
Posts: 1305
Registered: 6-4-2012
Location: Gent, Belgium
Member Is Offline
Mood: No Mood
|
|
I distilled technical quality toluene, to keep it completely anhydrous I added a few thin flakes of pure Na.
two days later they look like this:
what could there be in redistilled toluene that turns brown in contact with Na or NaOH?
Do I need to distill it again, or can I get away with filtration? (400ml)
all above information is intellectual property of Pyro.  |
|
|
elementcollector1
International Hazard
Posts: 2684
Registered: 28-12-2011
Location: The Known Universe
Member Is Offline
Mood: Molten
|
|
Seems like sodium oxide - I get that brown/yellow finish on my sodium as well. Not in toluene, though.
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
|
|
|
Pyro
International Hazard
Posts: 1305
Registered: 6-4-2012
Location: Gent, Belgium
Member Is Offline
Mood: No Mood
|
|
Ok, thanks. Do I need to re-distill it or can I just filter the floating ''stuff'' out?
all above information is intellectual property of Pyro. |
|
|
elementcollector1
International Hazard
Posts: 2684
Registered: 28-12-2011
Location: The Known Universe
Member Is Offline
Mood: Molten
|
|
Should probably re-distill it, but either way works. The 'stuff' should also keep your solution dry, so best to keep it in there long-term.
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
|
|
|
Pyro
International Hazard
Posts: 1305
Registered: 6-4-2012
Location: Gent, Belgium
Member Is Offline
Mood: No Mood
|
|
the Na sinks in toluene, but the stuff looks like scurf and floats around 
all above information is intellectual property of Pyro. |
|
|
bismuthate
National Hazard
Posts: 803
Registered: 28-9-2013
Location: the island of stability
Member Is Offline
Mood: self reacting
|
|
How would FeCl3 react with sodium acetate?
|
|
|
DraconicAcid
International Hazard
Posts: 4356
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline
Mood: Semi-victorious.
|
|
Probably through hydrolysis. Fe3+ + H2O + OAc- -> Fe(OH)2+ + HOAc.
With enough acetate ion, you'll get iron(III) hydroxide precipitating.
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.
|
|
|
BlackDragon2712
Hazard to Others
Posts: 124
Registered: 22-12-2012
Location: Everywhere
Member Is Offline
Mood: Sleepy
|
|
Question
does anyone knows where to get tert-butanol?
[Edited on 06/11/2013 by BlackDragon2712]
|
|
|
plante1999
International Hazard
Posts: 1936
Registered: 27-12-2010
Member Is Offline
Mood: Mad as a hatter
|
|
I do.
I never asked for this.
|
|
|
elementcollector1
International Hazard
Posts: 2684
Registered: 28-12-2011
Location: The Known Universe
Member Is Offline
Mood: Molten
|
|
U2U sent regarding potential availability. Unfortunately, I have no idea where you live...
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
|
|
|
chemrox
International Hazard
Posts: 2961
Registered: 18-1-2007
Location: UTM
Member Is Offline
Mood: LaGrangian
|
|
Check the library here. This is covered in "purification of laboratory chemicals."
I would do a fractional distillation first. You could skip the bisulfite step as most oil of bitter almond is 98% (or more) benzaldehyde.
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
|
|
|
chemrox
International Hazard
Posts: 2961
Registered: 18-1-2007
Location: UTM
Member Is Offline
Mood: LaGrangian
|
|
| Quote: Originally posted by SHADYCHASE54 | | I have a quick question regarding removing the acetyl group from n-acetyl-4-piperidone what I am wondering is were I to reflux with a slight molar
excess of potassium hydroxide will I shed the acetyl leaving the 4-piperidone in tact? If you have any experience I would love to hear from you as
well if you might have any pertinent refs all aid would be appreciated. |
Try strong base in ethylene glycol or DMSO. 4-piperidone polymerizes on formation so it is sold as the dihydro-HCl. The water molecules are a
formality since it is actually a diketal. Let me know how it goes or send me what you've got and I'll give you an eq amt of the product of commerce.
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
|
|
|
bismuthate
National Hazard
Posts: 803
Registered: 28-9-2013
Location: the island of stability
Member Is Offline
Mood: self reacting
|
|
Does anybody know a solvent for calcium/alkali metal carbides?
|
|
|
DraconicAcid
International Hazard
Posts: 4356
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline
Mood: Semi-victorious.
|
|
Calcium carbide is actually an acetylide- a strong base, but one can work with it. Avoid esters and alcohols, obviously, but you need something polar
or it won't dissolve. Acetonitrile is probably to acidic; acetone is too vulnerable to nucleophilic attack...I'd try THF. Even if it's not very
soluble, it might disperse enough to be a good reaction medium.
For an alkali metal acetylide, you might be able to make it more soluble by adding TMEDA (tetramethylethylenediamine).
[Edited on 5-12-2013 by DraconicAcid]
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.
|
|
|
bismuthate
National Hazard
Posts: 803
Registered: 28-9-2013
Location: the island of stability
Member Is Offline
Mood: self reacting
|
|
(I don't know much about organic chem so I may say something stupid)From what I have seen on SM CaC2 does not seem to react with ethanol. Might it be
slightly soluble in that? I would also wonder about liquid ammonia.
[Edited on 5-12-2013 by bismuthate]
|
|
|
elementcollector1
International Hazard
Posts: 2684
Registered: 28-12-2011
Location: The Known Universe
Member Is Offline
Mood: Molten
|
|
Online sources typically state the concentration of selenium in dietary supplements to be 200 micrograms per tablet. Considering each tablet weighs
considerably more than 200 ug, what's the rest?
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
|
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
my guess would be binders,preservatives and flavors or sweeteners
http://en.wikipedia.org/wiki/Excipient
|
|
|
| Pages:
1
..
3
4
5
6
7
..
104 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
