January 24, 2021, 05:20:47 PM
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Topic: BF3 Etherate  (Read 6357 times)

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Offline Honclbrif

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BF3 Etherate
« on: July 11, 2011, 10:29:18 AM »
I've got an old bottle of BF3-OEt2 that's turning brownish. Is it worth distilling it, or should i just get a new one?
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Offline Dan

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Re: BF3 Etherate
« Reply #1 on: July 11, 2011, 11:16:27 AM »
I've never attempted to distill it because it's really cheap.
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Offline nox

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Re: BF3 Etherate
« Reply #2 on: July 11, 2011, 11:46:25 AM »
Get a new one, OR if you're not running something terribly important, go ahead and do a small scale reaction and see how it works. I've used yellow-brown BF3 from a Sigma bottle that had a terribly corroded SureSeal cap and the reaction still went fine. Granted it was a rather trivial FC cyclization so YMMD.

Offline Åke

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Re: BF3 Etherate
« Reply #3 on: July 11, 2011, 09:34:31 PM »
Depends what you want to do. I've been able to get away with the dark brown boron trifluoride etherate when making borane (from NaBH4). If your substrate is a very valuable one then I think it's better to buy a new bottle of BF3·O(Et)2 especially as it is inexpensive.

Offline g-bones

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Re: BF3 Etherate
« Reply #4 on: July 21, 2011, 06:43:13 PM »
like these guys have said, if it isn't terribly important material you are using, just use an excess of BF3.  If ordering is a pain and you don't have the time to wait for your new bottle to arrive AND the reaction is sensitive to small impurities, give it the old distillation, its not horribly hard, but its a bit of a pain. 

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