Rapid and efficient microwave assisted method for the regioselective synthesis of 8,8′‐methylene‐bis‐4‐oxo‐1H and 2H‐chromeno[4,3‐C]pyrazoles

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.

http://link.springer.com/content/pdf/10.1007/BF00471581.pdf

Heterocyclic analogs of xanthone: IV. Physicochemical properties of 9-oxochromeno-[3,2-d]pyrazoles, 9-oxothiochromeno[3,2-d]pyrazoles, and 8-oxodipyrazolopyrans

M. P. Noskova

Papers

Heterocyclic analogs of xanthone: IV. Physicochemical properties of 9-oxochromeno-[3,2-d]pyrazoles, 9-oxothiochromeno[3,2-d]pyrazoles, and 8-oxodipyrazolopyrans