ribbit
Harmless
Posts: 6
Registered: 4-9-2009
Member Is Offline
Mood: No Mood
|
|
oxidation of anethole
Hey all, I'm totally new to this scene but I think I have somewhat of a mind to be useful but first I have to learn the basics!
I am attempting to convert anise oil to anisaldehyde with minimal, hopefully no leftover contaminants with OTC materials.
The first method I discovered was oxidative cleavage, suspending 20 grams of anise oil in 150 ml water and adding 30 ml of concentrated sulfuric acid
with 55 grams of sodium dichromate then pulled with toulene (I imagine Xylene would work as well) to yield around 9 grams of anisaldehyde.
The roadblock I hit with this method was acquiring sodium dichromate... so I started looking into alternatives.
The question I had to ask myself was "why sodium dichromate?" Apparently potassium dichromate is used for similar things as sodium dichromate such as
oxidizing but has a different solubility in water... sodium hydroxide is also available but I fail to understand why specifically sodium dichromate is
needed and I wonder if sodium hydroxide would provide the same end result.
Another option could be to synth sodium dichromate but i'd rather avoid this if possible.
-----
So before I go forward, is there any reason why I should not use potassium dichromate?
|
|
|
kclo4
National Hazard
Posts: 916
Registered: 11-12-2004
Location:
Member Is Offline
Mood: No Mood
|
|
You need to use a dichromate of some sort at least, that is what does the oxidizing. Sodium hydroxide wouldn't do anything really...
Look into the toluene-> benzaldehyde thread and read a bunch about the Mn persulfate oxidizer for making aldehydes.
|
|
|
Inoxia
Harmless
Posts: 12
Registered: 2-9-2009
Member Is Offline
Mood: No Mood
|
|
Make the dichromate from the sodium hydroxide!
buy Chromium oxide from a pottery/chemical supplier then fuse the NaOH and Cr2O3.
Acidify you sodium chromate product with acetic acid glaciel to produce you Sodium dichromate!
|
|
|
ribbit
Harmless
Posts: 6
Registered: 4-9-2009
Member Is Offline
Mood: No Mood
|
|
well I was able to procure some potassium dichromate but the store didn't have chromium oxide...
is there a way to use the potassium version or a way to convert the potassium dichromate into chromium oxide to further convert into sodium
dichromate?
|
|
|
Inoxia
Harmless
Posts: 12
Registered: 2-9-2009
Member Is Offline
Mood: No Mood
|
|
why not use K2Cr2O4 instead of the sodium salt? they work exactly the same, just use different amounts of solvent becuase the K salt is less soluble.
If not reduce the k salt with anything, say ethanol, then precipitate out the chromium hydroxide with any alkali metal hydroxide salt, then use that
instead of chrome oxide with NaOH.
|
|
|
ribbit
Harmless
Posts: 6
Registered: 4-9-2009
Member Is Offline
Mood: No Mood
|
|
why K2Cr2O4 as opposed to K2Cr2O7?
I feel like leonidas fighting against the 300 in-acquirable chemicals list.
|
|
|
Inoxia
Harmless
Posts: 12
Registered: 2-9-2009
Member Is Offline
Mood: No Mood
|
|
Sorry yes thats what i meant, im tired 
|
|
|
ribbit
Harmless
Posts: 6
Registered: 4-9-2009
Member Is Offline
Mood: No Mood
|
|
alright i'll work with the information presented TYVM!
THIS... IS... SCIENCE!!!
|
|
|
kclo4
National Hazard
Posts: 916
Registered: 11-12-2004
Location:
Member Is Offline
Mood: No Mood
|
|
Make sure you adjust for the molar ratio's.. obviously.
Hopefully you know that 10 grams of sodium dichromate is not equal to 10 grams of potassium dichromate.
|
|
|
ribbit
Harmless
Posts: 6
Registered: 4-9-2009
Member Is Offline
Mood: No Mood
|
|
i was thinking about that as well ty for the reminder
|
|
|
zed
International Hazard
Posts: 2284
Registered: 6-9-2008
Location: Great State of Jefferson, City of Portland
Member Is Offline
Mood: Semi-repentant Sith Lord
|
|
Ozone.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
