Abstract
It was shown by UV and PMR spectroscopy that most of the structural analogs of physovenine exist in the closed three-ring form in neutral solutions, while in acid solutions most exist as protonated indolenine derivatives (open form). The region of the equilibrium existence of the closed and open forms as a function of the solution pH was found by UV spectroscopy.
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See [1] for communication XXIII.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1194–1200, September, 1971.
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Grandberg, I.I., Dashkevich, S.N. Indoles. Chem Heterocycl Compd 7, 1123–1127 (1971). https://doi.org/10.1007/BF00510017
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DOI: https://doi.org/10.1007/BF00510017