Abstract
The fine structure of 2-(indane-1′,3′-dionid-2′-yl)pyridinium (α-pyrophthalone) was determined by PMR spectroscopy and x-ray diffraction analysis. The α-pyrophthalone molecule is almost planar; the dihedral angle between the pyridine ring and the indanedione ring is 5°. The structure is stabilized by an intramolecular hydrogen bond with a length of 2.73 Å. The molecules are packed in the crystal at van der Waals distances similar to those in molecular self-complexes. The data obtained for α-pyrophthalone confirm a dipolar ion structure.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1076–1080, August, 1978.
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Kemme, A.A., Bundule, M.F., Bleidelis, Y.Y. et al. Chemical peculiarities and structure of 2-(indane-1′, 3′-dionid-2′-yl)pyridinium (α-pyrophthalone). Chem Heterocycl Compd 14, 865–869 (1978). https://doi.org/10.1007/BF00469864
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DOI: https://doi.org/10.1007/BF00469864