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Bandil
(The Archetypical "Good Guy")
06-05-04 22:09
No 511664
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Tip for starting failed grignard reactions
(Rated as: good idea!)
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Today, when working with a grignard reaction, using benzylchloride in ether, I got a little sloppy.
The glassware was not dried for as long as it usually is, prior to doing this reaction. For the first time I was unable to initiate the reaction using heat. Heated the benzylchloride/ether/Mg to reflux, but nothing. I was just about to add some iodine to kickstart it, when I got a really good idea!
2 g's 3A mol. sieves where nuked at full power in the microwave for 1 min. These where added in one portion to the ether reaction mixture and stirred for a minute. Upon touching the flask with my bare hand, the reaction started ![Cool cool](../forum/images/icons_lightgrey/cool.gif)
The sieves can most likely not be reused, but two grams can probably be spared in the long run.
The conclusion is that in-situ drying of failed grignard rections works like a charm So save that iodine - pre nuked molecular sieves are the way to go!
Enjoy and happy summer living!
Regards Bandil
Nuke the whales!
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