ORGLIST:Re: Everybody digest, Vol 2 #97 - 1 msg

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From: Paul D. Jones (pdjones$##$ucdavis.edu)
Date: Tue Jul 20 2004 - 11:38:07 EDT


I have found that quenching the carbanion with finely powdered dry ice
works well. of course, this is assuming you have formed the anion, which I
have also found to be tricky.

To dry CO2(g), I pass it through a column of crushed activated 4A sieves.
This seems to work pretty well.

Good luck!

-Paul

================================
Paul D. Jones, Ph.D.
NIH Postdoctoral Fellow
Department of Entomology &
Cancer Research Center
University of California, Davis
Davis, CA 95616

================================

The At 11:07 PM 7/19/2004, you wrote:
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>Today's Topics:
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> 1. carboxylation (Massimiliano Lamberto)
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>Message: 1
>Date: Fri, 16 Jul 2004 10:06:19 -0400 (EDT)
>From: "Massimiliano Lamberto" <malamber$##$andromeda.rutgers.edu>
>To: <everybody$##$orglist.net>
>Reply-To: malamber$##$andromeda.rutgers.edu
>Subject: ORGLIST:carboxylation
>
>Dear collegues,
>
>I need to do a carboxylation of tetraiodophenyl-adamantane by using tBuLi
>and then bubbling in CO2 gas. Unfortunately I get very poor yields and I
>believe the CO2 I bubble in is not very dry. Does any of you know of an
>efficient method to dry the gas prior to addition to the raction mixture?
>Any comments or suggestions are very much appreciated.
>
>Thank you in advance for your help
>
>Max
>
>
>--
>Massimiliano Lamberto PhD
>Chemistry Department
>Rutgers University,
>Room 335, 73 Warren Street
>Newark, NJ, 07102
>U.S.A.
>
>
>
>
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