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Date: Sat, 13 Mar 2010 10:55:27 -0800
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Date: Sun, 14 Mar 2010 09:46:11 -0500
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Nail, John" <jnail**At_Symbol_Here**OKCU.EDU>
Subject: Re: Inactivation of Meta chloro peroxybenzoic acid
In-Reply-To: <48A020E1942E024DB0F2A6B68A1312440788CB6911**At_Symbol_Here**XEDAMAIL2.ex.ad3.ucdavis.edu>

Peroxyacids (RCO3H) are strong oxidizers; basically, they react by 'donatin
g' oxygen atoms to reducing agents

RCO3H + reducing agent --> RCO2H (a carboxylic acid) + Reducing agent + an 
O atom; further chemistry may occur with the oxidized reducing agent.

Any decent reducing agent will work; one advantage of using Fe+2 ions, such
 as in ferrous ammonium sulfate, is that the Fe+2 will be oxidized to Fe+3;
 this should give a color change which can be used to confirm that the reac
tion occurred.

To answer the question, there may not be a 'preferred method'; there are do
zens of reagents that should work.

-----Original Message-----
From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of De
bbie M. Decker
Sent: Friday, March 12, 2010 5:57 PM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: [DCHAS-L] FW: Inactivation of Meta chloro peroxybenzoic acid

Hey all you chemists out there!  I don't quite know where to begin to give 
my colleague, Dexter, advice.

Ideas?

-----Original Message-----
From: Dexter

Debbie
We are using MCPBA to make some epoxides.  I need to purify the MCPBA 
before I use it and the wash and crystalization process leaves a 
significant anoumt in solution.  Usually dichloromethane. I will 
obviuosly discard this solution as toxic waste but I want to deactivate 
the MCPBA that remains.  I have read you can use NaI , ferrous ions, 
potassium hydroxide, sodium thiosulfate, etc.  What in your knowledge is 
the preferred method.  Thanks.   Dexter
-----------------------------

Debbie M. Decker, Campus Chemical Safety Officer
Environmental Health and Safety
University of California, Davis
1 Shields Ave.
Davis, CA=A0 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

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