Conclusions
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1.
N,N-disubstituted 3-amino-2-aryl-1-indenones are protonated by perchloric and trichloroacetic acids in deuteroacetone at C2 with the formation of the corresponding 3-oxo-2-aryl-1-indaniminium salts.
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2.
An increase in the barrier to the hindered internal rotation about the C-N bond in N,N-disubstituted 3-amino-2-aryl-l-indenones is observed with a decrease in the extent of the C2-protonation of these compounds.
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Literature cited
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1399–1402, June, 1989.
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Lavlinskaya, L.I., Usova, T.L., Dorofeev, I.A. et al. PMR spectral study of the protonation of N,N-disubstituted 3-amino-2-aryl-1-indenones. Russ Chem Bull 38, 1280–1282 (1989). https://doi.org/10.1007/BF00957172
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DOI: https://doi.org/10.1007/BF00957172