I don't know where this thread should go so I'm putting it here. Feel free to move it.

Does anyone have any recommended books on hydrogenation and the preparation of catalysts?

I am specifically looking for info on the prep of platinum or palladium from Pt/Pd Cl salts with NaBH4. From my reading it seems like people are going to a lot of trouble to prep Adams catalyst platinum oxide from Chloroplatinic acid, just to reduce it to Pt to use it in ethanol when Chloroplatinic acid can be reduced by NaBH4 to active Pt in ethanol, skipping the +500C kiln oven prep.

Hydrogenation is also fun because these reductions can be done on the imine from glycine and (insert favorite flavor here)p2p without affecting the carboxylic acid. Decarb or let your body do it for you.

Hydrogenation Methods - Paul N. Rylander (1985)


http://www.scribd.com/doc/12100853/Hydrogenation-Methods-Paul-N-Rylander-1985

Hydrogenation is also fun because these reductions can be done on the imine from glycine and (insert favorite flavor here)p2p without affecting the carboxylic acid. Decarb or let your body do it for you.

.......interesting comment, what is your reference for this and what do you propose the once aminated material looks like.....just curious ......java

First off, Java, you are the best. If anyone didn't catch this prep, you might want to.

"Indeed, the platinum catalyst obtained by this simple procedure exhibits an activity of nearly 100 per cent. greater than that of commercial platinic oxide (Adams catalyst2) now widely used for laboratory hydrogenation." They also prep rhodium, palladium and others in the same manner.

So making a logical stretch, if the hydrogenation isn't harmed by acidic conditions then this should run. For the workers thinking md or strait p2p and methylamine, I see the methylamine salting that acid anyway and the whole thing getting basic. What about not bothering with acid quench of NaBH4 since it should also be doing the required job?

Quick math says that NaBH4 is 4 hydride (H) equivalents, and Chloroplatinic acid requires 12 to get to reduced Pt black, so these jokers are using ~8.33 excess of NaBH4. If one follows their lead and assumes that it is 2x as effective, one might reduce the Pt to only .5g per mol of p2p, leaving an excess of ~2.1g NaBH4 in the mix if it is not hit with HCl. Or up it to 1g Pt per mol p2p and have ~4.3g excess NaBH4. These are appreciable amounts of excess reducing agent and would throw a wrench into calculating the hydrogen uptake, especially seeing as how NaBH4 is anything but precise in its action. What does anyone else think? Just follow the ref, I guess, but that isn't fun and will waste methylamine. I guess the pH could be monitored during HCl addition.

I really like the sound of room temperature and pressure hydrogenation even though I had already geared myself up for another A-team garage fabrication event. Not sourcing or compressing hydrogen is nice, too. I guess adding optical glass repair to my list of drug jobs isn't the worst thing. If anyone needs anything chromed, aromatherapy soaps & candles or custom plastic castings, just ask.

Nobody I know is going to start tossing NaBH4 in acid to make H2. Zinc HCl seems better. Anyone got any favorites?

I don't know where I found this, probably here, but
Schiff Bases. Part 1. Thermal Decarboxylation of a-Amino-acids in the Presence of Ketones
J. Chem. SOC. (C), 1968 p406-410 is the lowdown on the carb acid schiff base. I don't think researchers here have it in them to heat ketone and glycine.

Onto research that might get done, looking at the PtCl6 NaBH4 reduction to platinum black, is its stated increase in effectiveness due to it being Pt(VI), not Pt(IV) or am I way off.

As stated before, I am retarded and physically deformed. Feel free to ridicule.

See attached reference.