NeverSleepy
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Simple hydrogenation?
Some professor tells me that boiling ephedrine and platina black [I assume any catalyst metal will do] in 25% hcl for 5 hours will yeild meth
[75-85%].
Why dont I see anything this simple at rhodium? Was this guy rooster pooting or should I go yank the catylict converter off my car?
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vulture
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This will not work with just any metal.
Hydrogenation works with platinum because it can store a volume of hydrogen gas dat is a few hundred times it's own volume.
Besides that it will convert the hydrogen gas to a more reactive species.
Hydrogen gas will pass through a redhot platinum sheet as if it wasn't there.
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NeverSleepy
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wtf?
Thanks for the info, but im looking for a yes or no with a brief explanation type answer.
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Organikum
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~ No! ~
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boiling ephedrine and platina black ...
... in 25% hcl for 5 hours will yeild
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a mixture of pseudoephedrine and ephedrine.
for a hydrogenolysis you need at least hydrogen.
.
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NeverSleepy
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really? wow!
When you drop some platina black into hcl, bubbles start coming off it. Arent these bubbles hydrogen?
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Organikum
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You got
exactly what you asked for.
Believe it or don´t believe it, I don´t mind. You are looking for trouble? Look somewhere else please.
sincerly yours
ORG
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NeverSleepy
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My middle name is trouble!
I dont think you understand that this rxn takes place WITHOUT an external hydrogen source. Upon further research, I found this http://www.rhodium.ws/chemistry/dihydromorphinones.html Why would it be pointless to use ephedrine as starting material?
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Organikum
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Not if you want methcathione
if Zn is used as catalyst in conc. HCl, about 10% yield of racemic Methamphetamine are possible. With an external hydrogen source. But thats more a
sidereaction of a overdone racemisation with lots of other sideproducts.
Pt black splits HCl? No. Not at this side of the galaxis.
this works:
GAA as solvent
Pd/BaSO4 as catalyst
perchloric acid as promotor
1-3atm H2
80-90°C
(Rosenmund & Karg 1942)
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NeverSleepy
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Damn
So the codeine synth is bs?
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Organikum
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?????
You asked if this reaction could be used for dehydroxylating ephedrine. As this reaction obviously is a dehydrogenation the answer is NO. The product
if used on ephedrine would be methcathione.
You might go to erowid and have a look at the molecules of methamphetamine and ephedrine for a better understanding.
http://www.erowid.org/
In the compounds database if I remember right.
ORG
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