dormouse (Member)
04-25-00 00:15
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Author  Topic:   Cheapskate 
Member   posted 11-17-1999 08:28 PM          
I read that Nitro toulene is reduced to O-toluidine using electric reduction using Pladium carbon as a catalyst. Do you know anything on this and could this be a simpler way of reduction. The iron reduction is a drag. I think there has to be a more easy way to go!
Moderator   posted 11-18-1999 03:56 AM          
You can use simple catalytic hydrogenation. o-MePhNO2 + H2 Pd/C -> o-MePhNH2
Member   posted 11-18-1999 04:41 PM          
No, I haven't heard about this. I did try a number of other reductions that piglet sent me and most of them just didn't work. One that did was dissolving zinc in HCl. I had to contend with greasy zinc oxide that resulted from the reaction. I still had to steam distill to get the o-toluidine out, but it didn't stink as bad. Yield was somwhat lower.
My problem with hydrogenations is that they are usually far from "simple". One description I saw was about 45 steps using specialized equipment. For simplicity, it's hard to equal iron power disolving in HCl acid. Actually this method wouldn't be too bad if we could get the stirring problem solved cheaply. Sealed reflux stirring systems don't come cheap.

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