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I'm trying to figure out the mechanism for this reaction
(the product is in the second image ). As far as I understand, it is an electrophilic aromatic substitution, but I don't understand how to get a bromonium ion out of the NBS. I read that the Br in an N-Br bond has a partial positive charge so could the triazole attack it directly? Or do I need to first separate the Br, turn it into a bromonium ion, and then attack that ion with the triazole? If so, does anyone know how to do that? I read that it can be done in the presence of HBr, but this reaction does not include HBr anywhere, so I'm not sure what happens there.
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