From: Jacob Zabicky (zabicky$##$bgumail.bgu.ac.il)
Date: Mon Sep 02 2002 - 05:26:33 EDT
Hello Gary,
If active charcoal realy stads up to its name, it has many reactive sites
tha can undego reaction with oxidants. If this is the case, its a long way
for a carbonaceous substrate to react up to the stage of producing CO. One
can postulate formation of stable intermediates such as epoxides,
peroxides, alcohols, aldehydes/ketones, carboxylic acids and combinations
thereof, not to mention some metastable ones, such as free radicals, before
CO is emitted. Of course, one may try to detect the presence of such
functions in the substrate by a variety of analytical methods. On the other
hand, under certain conditions effervescence might be expected from the
reaction 2H2O2 ---> H2O + O2, catalyzed by impurities of the charcoal.
All the best,
Jacob
At 03:57 30/8/2, Gary Randall wrote:
>Hi Everyone,
>>
>> Recently I've prepared pyridine-N-oxides by oxidation with hydrogen
>peroxide
>> in acetic acid. The literature procedure that I've followed states that
>at
>> the end of the reaction charcoal is added to destroy excess hydrogen
>> peroxide. When I did this I was expecting large amounts of gas (CO or
>CO2)
>> to be produced, but nothing appeared to be happening at all. Does anyone
>> know if treating solutions of hydrogen peroxide or peracids with charcoal
>> actually causes a reaction, and if so what is happening.
>>
>>
>> Dr. Gary Randall,
>> Senior Research Scientist,
>> Radiochemistry ,
>> SCYNEXISEurope Ltd.
>>
>>
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Prof. Jacob Zabicky
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