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Consulting various Organic Chemistry resources, I have found two reactions for the purpose stated in the subject:

First reaction:

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Second reaction: enter image description here

But, I cannot find the reaction mechanism by which they take place. Which would be necessary for an exercise, the conversion of m-dinitrobenzene to m-chloronitrobenzene, in which I want to introduce as an intermediate step one of these two reactions. I suppose that the mechanism will be very similar, but I cannot find what it is.

Carlos
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    This is known as Zinin reduction, a review is here (if you have institutional access) : https://onlinelibrary.wiley.com/doi/abs/10.1002/0471264180.or020.04 otherwise look here https://chemistry.stackexchange.com/questions/34066/selective-nitro-reduction-of-poly-nitro-compounds AFAIK the mechanism for this reaction remains obscure. – Waylander Jan 15 '22 at 13:28
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    It does work. Have successfully reduced 4-methyl-3,5-dinitrobenzoic acid by the Zinin method. – user55119 Jan 15 '22 at 15:19
  • I have also used this to selectively reduce dinitrobenzenes – Waylander Jan 15 '22 at 17:38

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