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Topic: DCM with mol sieves  (Read 4318 times)

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Offline sanderol

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DCM with mol sieves
« on: March 23, 2011, 10:33:21 AM »
When I make my solution of DCM-d2 gas and water "free" I add some molsieves before I freeze pump thaw. Over time I always see some powder formation, which I do not see with other solvents.

Anybody any idea what that is?
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Offline Honclbrif

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Re: DCM with mol sieves
« Reply #1 on: March 27, 2011, 08:48:21 AM »
My first instinct is that its pulverized sieves which are for some reason less flocculant in DCM than your other solvents. I've noticed that the sieves I have in Et2O have less dust than the ones I keep in ACN (neither deuterated). I don't really have a decent explanation for this though. I find its just best to leave the dusty ones undisturbed when removing solvent.

However, sieves can catalyze some reactions.
http://curlyarrow.blogspot.com/2010/04/anhydrous-solvents-part-3-acetone-and.html

Do you have abnormal peaks in your spectra?
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Offline sanderol

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Re: DCM with mol sieves
« Reply #2 on: April 05, 2011, 10:37:15 AM »
No it doesnt intervene with my reactions. I was just wondering what it was.
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