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Previous by Date: Subject: Fw: Unexpected outcomes Date: Fri, 10 Mar 2006 14:32:00 -0600 Author: William Parks |
Next by Date: Subject: Re: Questions out of my realm Date: Fri, 10 Mar 2006 13:48:30 -0700 Author: "Nunn, Nate" |
You've gotten some good responses about the butyl lithium so I won't add to the confusion. But as to the ether - it has such a low boiling point, heating in a warm water bath or even with the hands on the outside of the flask will get the ether warm enough to boil. I remember, a hundred years ago (dinosaurs roamed the earth!) launching a Grignard reaction in just that way. We set up the apparatus and just heated the ether in the reaction flask by cupping our hands around the flask. Just enough warm to get the reaction going, nice and gently. Hotplate/stirrer=sparks which won't peacefully co-exist with ether vapors. A heating mantle (turned on very low) or a warm water bath (not boiling and certainly not steam) will be enough to boil the ether. Hope this helps, Debbie ---------------------- Debbie M. Decker, Campus Chemical Hygiene Officer Environmental Health and Safety University of California, Davis 1 Shields Ave. Davis, CA 95616 (530)754-7964/(530)752-4527 (FAX) dmdecker**At_Symbol_Here**ucdavis.edu Co-Conspirator to Make the World A Better Place -- Visit www.HeroicStories.com and join the conspiracy -----Original Message----- From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of ACTSNYC**At_Symbol_Here**CS.COM Sent: Friday, March 10, 2006 8:51 AM To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU Subject: [DCHAS-L] Questions out of my realm All, I got the following two questions from a colleague and since I work in the art field, these are out of my area. Can I get some help? 1. a student was boiling ether in a large open flask on a stirrer hotplate and the fume alone caught on fire, inside the hood. . Do you have suggestions for them to reduce the ether amount for re-crystallization in a safer manner? 2. a student in was quenching butyl lithium with n-propanol in an open flask and it also caught on fire. Is there a safer way to quench the butyl lithium w;ithout catching on fire? Monona Rossol
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