The Hive > Stimulants

What Psuedo Impurities Affect Cat. Hydrogenation?

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lab_bitch:
Does anyone know the particular denaturants in store bought psuedo that would poison Pt/C or Pd/C catalysts if one wanted to hydrogenate it?  Has anyone actually tried to hydrogenate store bought psuedo or is it just assumed that it is too impure to use?  Are there any OTC sources of ephedrine/psuedo that would be suitable for hydrogenation?

lab_bitch:
I'm not talking about throwing whole pills in.  Many people have said that sudafed will not work for hydrogenations, even after thoroughly cleaning them.  In other words, there are compounds in the pills that will poison the catalyst even in very minute quantities.  After reading the ingrediants on the box, I didn't see anything that would seem capable of poisoning the catalyst.  All I want to know is if anyone has actually run straight E and sudafed in the exact same rxn with the results being that the E worked fine but the sudafed didn't.

ragnaroekk:
you have neither the theoretical nor practical knowledge to get this going even with SIGMA-ALDRICH material.
Btw. Ephedrine is a chemical but sudafed is the name of a brand.

Didn´t answer your question....
UTFSE!
but now I did.

lab_bitch:

ragnaroekk:
the one who is interested in catalytic hydrogenation finds:
https://www.thevespiary.org/rhodium/Rhodium/pdf/poisoning_and_deactivation.pdf

and more.

Reading this highly interesting article prevents from asking questions like those asked in this thread at start - provided that one understands what is written.

I am to lazy to
- explain why the questions have been not on the point
- explain how the right questions would have looked like
- and to answer these questions .

Not for someone with this special attitude.  :)
Would be wasted time anyways.

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