Sciencemadness Discussion Board

Mn(III)catalyst prep and subsequent rxn?

nightflight - 14-2-2007 at 19:29

Hi,

after some reading I decided to prepare the Mn(III)(0AC)*2H2O
catalyst from Mn(II)(OAc)*4H2O
and the procedure seems just to filter off the Mn, then, it´s dried, re-used with acetic acid as a solvent in further reactions, so why borther cleaning the flask and using new acetic acid, when essentially the reaction conditions remain the same with leaving it as is?

thanks, nightflight





edit: this maybe should be moved to reagents acquisition.


Title edit by Chemoleo:
It is Mn, not Mg.

[Edited on 17-2-2007 by chemoleo]

Baphomet - 14-2-2007 at 19:59

So you're getting Mn precipitate after using the catalyst? Best practise is to separate the metal and wash it before using it again. Otherwise the next reaction will contain rubbish from the last one, or maybe even the formation of the acetate salt would be hindered.

nightflight - 14-2-2007 at 20:21

Yes, you´re right, cleaning and reaction work-up is my weakness, but then again, I´m lazy, at least for the first time until something failed.:(

Baphomet - 14-2-2007 at 20:48

Hehe that's something I'm guilty of too :P

Organikum - 15-2-2007 at 20:10

Quote:
Originally posted by nightflight
....
after some reading I decided to prepare the Mn(III)(0AC)*2H2O
catalyst from Mn(II)(OAc)*4H2O
and the procedure seems just to filter off the Mn, then, it´s dried, re-used with acetic acid as a solvent in further reactions, so why borther cleaning the flask and using new acetic acid, when essentially the reaction conditions remain the same with leaving it as is?

thanks, nightflight
....
Bold mine. Its just a guess but maybe it has to do with the drying? If you have acetic anhydride or ketene then this step might be obsolete.
But its really just a guess....