Question

explain nitration of pyrrole​

Answer 1

Answer:

that the electrophile in nitration is the nitronium ion, |NO2. Substitution at the two different positions of pyrrole by the nitronium ion gives different carbocation intermediates: Substitution at carbon-2: ... 2-Nitropyrrole is the major nitration product of pyrrole, as predicted.

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Answer 2

Answer:

Would 2,5-dinitropyrrole be a product of nitration of pyrrole with H2SO4/HNO3HX2SOX4/HNOX3? It seems that 2,5-dinitropyrrole is not formed when using Ac2O/HNO3AcX2O/HNOX3 (ref 1). Is this just because of the mild conditions used, or does this reflect the pyrrole ring being more deactivated by the first nitration than a benzene ring would be?

1 Cooksey, A. R.; Morgan, K. J.; Morrey, D. P. Nitropyrroles—II : The nitration of pyrrole. Tetrahedron 1970, 26 (21), 5101–5111