Heterocyclic analogs of xanthone

A comparative investigation of the acid-base properties, the polarographic behavior, and the spectral characteristics of oxochromeno- and oxothiochromenopyrazoles, oxodipyrazolopyrans, and their electronic analogs xanthone and thioxanthone, has been performed. The difference in properties is due to the electron-accepting nature of the condensed pyrazole ring.For communication III, see [8].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 990–992, July, 1973.