Zhao, Xiaolei; Wang, Min; Geng, Jiao; Huang, Wei - 2021
In this work, two new pyrazolone ester based heterocyclic hydrazone dyes have been prepared and characterized by NMR, FT-IR and MS spectrometry. The acid/base-activated hydrazone-azo tautomerism has been monitored by UV-Vis and 1 H NMR spectra. What is worth mentioning, three Fenton catalysts:...