|
 the
Hive BB  Chemistry
Discourse  Reactions
under preasure, why?
|
| next newest topic | next oldest topic |
| Author | Topic: Reactions under preasure, why? |
| TheCat Hive Bee |
posted 01-13-99 01:07 PM
I apolgize for my ignorance but why are some reactions caried out under higer preasures then 1atm? What is gained? The reason I ask is that in the Nitrite Wacker patent it says that the reaction can be caried out anywhere from atmospheric pressure to 200 kg/cm2. Peace TheCat |
| Bright
Star Hive Bee |
posted 01-13-99 03:05 PM
Increasing pressure, increases relative solubilities. IE the more pressure any two 'non-soluable' compounds are under.. the more soluable they become. A good pair of compounds are PdCl2 and alcohol. They are not really soluable in each other... but as soon as you pressurize your SRV, the solution becomes much clearer.... And ... questions are good. If you stop asking questions you stop learning! |
| Osmium PimpBee |
posted 01-14-99 04:28 AM
Increasing pressure increases solubility of the oxygen, not the PdCl2. PdCl2 is readily soluble in alcohols or water, but it takes a long time to dissolve, unless excess chloride ions are in solution, too. That's why it is best to dissolve the PdCl2 AND CuCl2 some time (e.g. a day) ahead of the reaction. |
| Bright
Star Hive Bee |
posted 01-14-99 08:10 AM
Hum.... I guess I should read the Merck a little closer, eh? |
| scwam Hive Bee |
posted 01-23-2000 04:59 PM
Osmium, I never found any mention on how many hours your 02 wacker was performed using 1g/4g to 100 alkene under 4atm in the champaigne bottle. Could you post this here. |
| Sploofer Hive Bee |
posted 01-23-2000 08:17 PM
basically replaces the lialhydrides see that lithium would take the oxygen simmiliar to the carbon platnium catalyst this could be operated electoally with a paladium electrode very effeciently................ See you couple a think like this....a zinc is deposited upon a platnium electrode this zinc is orgainic now,, umm solvent some ammonia??? Anywasy the zinc anode is removed and the container is made to be the
anode and the platnium is scrapped so some small amount of platnium is
added along wiht the zinc to a solution this ya add a haloidated something
to and stirr the haloid drops and the zinc hooks up......then ya add say
maybe some brominated cycloring stuff and turn it on and the brominated
stuff yep it reacts with the zinckified amine yep and it the zinc attaches
attacks the bromine and falls out into the solvent and goes to whereever
who cares???? and the pladium it is the attractant it does its inert the platnium wheather or not thats in a substrate form often it a crystakine type catalyst such it also has an amine nature and also is saturated the only way it interacts is to cordinate and conduct the proper reaction however zinc and copper will get the job done in higer yields the phosphor in it this would very much cause water to be lost........ |
| scwam Hive Bee |
posted 01-23-2000 09:05 PM
Well put, that answers my question Sploofer Everything is clear now. Hey Osmium, can you translate the above for me from Pooper or give me a more detailed answer than Pooper's. By the way Fman, simply speaking insnities now will not hold up in court once you get busted later. |
and the
zinc I think it goes into the solution it could be removed but thats
another mater.......
|
All times are CT (US) |
next newest topic | next oldest topic |
 
|
|
Contact Us | the Hive
Powered by: Ultimate Bulletin Board, Version 5.39a
© Infopop Corporation
(formerly Madrona Park, Inc.), 1998 -
1999.