Abstract
By electronic spectroscopy and PMR spectroscopy it has been shown that the protonation of derivatives of β- and α-acetylpyrroles and the corresponding formylpyrroles in 14–26 N H2SO4 takes place at the oxygen atom of the carbonyl group. The α derivatives substituted by an alkyl group (CH3, C2H5) in position 4 have a similar structure of the conjugate acids in concentrated H2SO4. Under the same conditions, the α derivatives not substituted in position 4 are capable of adding a proton to C4 of the pyrrole ring.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1498–1504, November, 1973.
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Struchkova, M.I., Dvoryantseva, G.G., Belova, T.P. et al. Protonation of acetyl and formyl derivatives of pyrrole. Chem Heterocycl Compd 9, 1355–1360 (1973). https://doi.org/10.1007/BF00470341
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DOI: https://doi.org/10.1007/BF00470341